SemaType.cpp revision 84e9ab44af3a16f66d62590505db2036ef0aa03b
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/ASTMutationListener.h" 17#include "clang/AST/CXXInheritance.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/Expr.h" 21#include "clang/AST/TypeLoc.h" 22#include "clang/AST/TypeLocVisitor.h" 23#include "clang/Basic/OpenCL.h" 24#include "clang/Basic/PartialDiagnostic.h" 25#include "clang/Basic/TargetInfo.h" 26#include "clang/Lex/Preprocessor.h" 27#include "clang/Parse/ParseDiagnostic.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/DelayedDiagnostic.h" 30#include "clang/Sema/Lookup.h" 31#include "clang/Sema/ScopeInfo.h" 32#include "clang/Sema/Template.h" 33#include "llvm/ADT/SmallPtrSet.h" 34#include "llvm/ADT/SmallString.h" 35#include "llvm/Support/ErrorHandling.h" 36using namespace clang; 37 38/// isOmittedBlockReturnType - Return true if this declarator is missing a 39/// return type because this is a omitted return type on a block literal. 40static bool isOmittedBlockReturnType(const Declarator &D) { 41 if (D.getContext() != Declarator::BlockLiteralContext || 42 D.getDeclSpec().hasTypeSpecifier()) 43 return false; 44 45 if (D.getNumTypeObjects() == 0) 46 return true; // ^{ ... } 47 48 if (D.getNumTypeObjects() == 1 && 49 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 50 return true; // ^(int X, float Y) { ... } 51 52 return false; 53} 54 55/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 56/// doesn't apply to the given type. 57static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 58 QualType type) { 59 bool useExpansionLoc = false; 60 61 unsigned diagID = 0; 62 switch (attr.getKind()) { 63 case AttributeList::AT_ObjCGC: 64 diagID = diag::warn_pointer_attribute_wrong_type; 65 useExpansionLoc = true; 66 break; 67 68 case AttributeList::AT_ObjCOwnership: 69 diagID = diag::warn_objc_object_attribute_wrong_type; 70 useExpansionLoc = true; 71 break; 72 73 default: 74 // Assume everything else was a function attribute. 75 diagID = diag::warn_function_attribute_wrong_type; 76 break; 77 } 78 79 SourceLocation loc = attr.getLoc(); 80 StringRef name = attr.getName()->getName(); 81 82 // The GC attributes are usually written with macros; special-case them. 83 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 84 if (attr.getParameterName()->isStr("strong")) { 85 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 86 } else if (attr.getParameterName()->isStr("weak")) { 87 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 88 } 89 } 90 91 S.Diag(loc, diagID) << name << type; 92} 93 94// objc_gc applies to Objective-C pointers or, otherwise, to the 95// smallest available pointer type (i.e. 'void*' in 'void**'). 96#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 97 case AttributeList::AT_ObjCGC: \ 98 case AttributeList::AT_ObjCOwnership 99 100// Function type attributes. 101#define FUNCTION_TYPE_ATTRS_CASELIST \ 102 case AttributeList::AT_NoReturn: \ 103 case AttributeList::AT_CDecl: \ 104 case AttributeList::AT_FastCall: \ 105 case AttributeList::AT_StdCall: \ 106 case AttributeList::AT_ThisCall: \ 107 case AttributeList::AT_Pascal: \ 108 case AttributeList::AT_Regparm: \ 109 case AttributeList::AT_Pcs: \ 110 case AttributeList::AT_PnaclCall: \ 111 case AttributeList::AT_IntelOclBicc \ 112 113namespace { 114 /// An object which stores processing state for the entire 115 /// GetTypeForDeclarator process. 116 class TypeProcessingState { 117 Sema &sema; 118 119 /// The declarator being processed. 120 Declarator &declarator; 121 122 /// The index of the declarator chunk we're currently processing. 123 /// May be the total number of valid chunks, indicating the 124 /// DeclSpec. 125 unsigned chunkIndex; 126 127 /// Whether there are non-trivial modifications to the decl spec. 128 bool trivial; 129 130 /// Whether we saved the attributes in the decl spec. 131 bool hasSavedAttrs; 132 133 /// The original set of attributes on the DeclSpec. 134 SmallVector<AttributeList*, 2> savedAttrs; 135 136 /// A list of attributes to diagnose the uselessness of when the 137 /// processing is complete. 138 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 139 140 public: 141 TypeProcessingState(Sema &sema, Declarator &declarator) 142 : sema(sema), declarator(declarator), 143 chunkIndex(declarator.getNumTypeObjects()), 144 trivial(true), hasSavedAttrs(false) {} 145 146 Sema &getSema() const { 147 return sema; 148 } 149 150 Declarator &getDeclarator() const { 151 return declarator; 152 } 153 154 bool isProcessingDeclSpec() const { 155 return chunkIndex == declarator.getNumTypeObjects(); 156 } 157 158 unsigned getCurrentChunkIndex() const { 159 return chunkIndex; 160 } 161 162 void setCurrentChunkIndex(unsigned idx) { 163 assert(idx <= declarator.getNumTypeObjects()); 164 chunkIndex = idx; 165 } 166 167 AttributeList *&getCurrentAttrListRef() const { 168 if (isProcessingDeclSpec()) 169 return getMutableDeclSpec().getAttributes().getListRef(); 170 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 171 } 172 173 /// Save the current set of attributes on the DeclSpec. 174 void saveDeclSpecAttrs() { 175 // Don't try to save them multiple times. 176 if (hasSavedAttrs) return; 177 178 DeclSpec &spec = getMutableDeclSpec(); 179 for (AttributeList *attr = spec.getAttributes().getList(); attr; 180 attr = attr->getNext()) 181 savedAttrs.push_back(attr); 182 trivial &= savedAttrs.empty(); 183 hasSavedAttrs = true; 184 } 185 186 /// Record that we had nowhere to put the given type attribute. 187 /// We will diagnose such attributes later. 188 void addIgnoredTypeAttr(AttributeList &attr) { 189 ignoredTypeAttrs.push_back(&attr); 190 } 191 192 /// Diagnose all the ignored type attributes, given that the 193 /// declarator worked out to the given type. 194 void diagnoseIgnoredTypeAttrs(QualType type) const { 195 for (SmallVectorImpl<AttributeList*>::const_iterator 196 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 197 i != e; ++i) 198 diagnoseBadTypeAttribute(getSema(), **i, type); 199 } 200 201 ~TypeProcessingState() { 202 if (trivial) return; 203 204 restoreDeclSpecAttrs(); 205 } 206 207 private: 208 DeclSpec &getMutableDeclSpec() const { 209 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 210 } 211 212 void restoreDeclSpecAttrs() { 213 assert(hasSavedAttrs); 214 215 if (savedAttrs.empty()) { 216 getMutableDeclSpec().getAttributes().set(0); 217 return; 218 } 219 220 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 221 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 222 savedAttrs[i]->setNext(savedAttrs[i+1]); 223 savedAttrs.back()->setNext(0); 224 } 225 }; 226 227 /// Basically std::pair except that we really want to avoid an 228 /// implicit operator= for safety concerns. It's also a minor 229 /// link-time optimization for this to be a private type. 230 struct AttrAndList { 231 /// The attribute. 232 AttributeList &first; 233 234 /// The head of the list the attribute is currently in. 235 AttributeList *&second; 236 237 AttrAndList(AttributeList &attr, AttributeList *&head) 238 : first(attr), second(head) {} 239 }; 240} 241 242namespace llvm { 243 template <> struct isPodLike<AttrAndList> { 244 static const bool value = true; 245 }; 246} 247 248static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 249 attr.setNext(head); 250 head = &attr; 251} 252 253static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 254 if (head == &attr) { 255 head = attr.getNext(); 256 return; 257 } 258 259 AttributeList *cur = head; 260 while (true) { 261 assert(cur && cur->getNext() && "ran out of attrs?"); 262 if (cur->getNext() == &attr) { 263 cur->setNext(attr.getNext()); 264 return; 265 } 266 cur = cur->getNext(); 267 } 268} 269 270static void moveAttrFromListToList(AttributeList &attr, 271 AttributeList *&fromList, 272 AttributeList *&toList) { 273 spliceAttrOutOfList(attr, fromList); 274 spliceAttrIntoList(attr, toList); 275} 276 277/// The location of a type attribute. 278enum TypeAttrLocation { 279 /// The attribute is in the decl-specifier-seq. 280 TAL_DeclSpec, 281 /// The attribute is part of a DeclaratorChunk. 282 TAL_DeclChunk, 283 /// The attribute is immediately after the declaration's name. 284 TAL_DeclName 285}; 286 287static void processTypeAttrs(TypeProcessingState &state, 288 QualType &type, TypeAttrLocation TAL, 289 AttributeList *attrs); 290 291static bool handleFunctionTypeAttr(TypeProcessingState &state, 292 AttributeList &attr, 293 QualType &type); 294 295static bool handleObjCGCTypeAttr(TypeProcessingState &state, 296 AttributeList &attr, QualType &type); 297 298static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 299 AttributeList &attr, QualType &type); 300 301static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 302 AttributeList &attr, QualType &type) { 303 if (attr.getKind() == AttributeList::AT_ObjCGC) 304 return handleObjCGCTypeAttr(state, attr, type); 305 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 306 return handleObjCOwnershipTypeAttr(state, attr, type); 307} 308 309/// Given the index of a declarator chunk, check whether that chunk 310/// directly specifies the return type of a function and, if so, find 311/// an appropriate place for it. 312/// 313/// \param i - a notional index which the search will start 314/// immediately inside 315static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, 316 unsigned i) { 317 assert(i <= declarator.getNumTypeObjects()); 318 319 DeclaratorChunk *result = 0; 320 321 // First, look inwards past parens for a function declarator. 322 for (; i != 0; --i) { 323 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1); 324 switch (fnChunk.Kind) { 325 case DeclaratorChunk::Paren: 326 continue; 327 328 // If we find anything except a function, bail out. 329 case DeclaratorChunk::Pointer: 330 case DeclaratorChunk::BlockPointer: 331 case DeclaratorChunk::Array: 332 case DeclaratorChunk::Reference: 333 case DeclaratorChunk::MemberPointer: 334 return result; 335 336 // If we do find a function declarator, scan inwards from that, 337 // looking for a block-pointer declarator. 338 case DeclaratorChunk::Function: 339 for (--i; i != 0; --i) { 340 DeclaratorChunk &blockChunk = declarator.getTypeObject(i-1); 341 switch (blockChunk.Kind) { 342 case DeclaratorChunk::Paren: 343 case DeclaratorChunk::Pointer: 344 case DeclaratorChunk::Array: 345 case DeclaratorChunk::Function: 346 case DeclaratorChunk::Reference: 347 case DeclaratorChunk::MemberPointer: 348 continue; 349 case DeclaratorChunk::BlockPointer: 350 result = &blockChunk; 351 goto continue_outer; 352 } 353 llvm_unreachable("bad declarator chunk kind"); 354 } 355 356 // If we run out of declarators doing that, we're done. 357 return result; 358 } 359 llvm_unreachable("bad declarator chunk kind"); 360 361 // Okay, reconsider from our new point. 362 continue_outer: ; 363 } 364 365 // Ran out of chunks, bail out. 366 return result; 367} 368 369/// Given that an objc_gc attribute was written somewhere on a 370/// declaration *other* than on the declarator itself (for which, use 371/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 372/// didn't apply in whatever position it was written in, try to move 373/// it to a more appropriate position. 374static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 375 AttributeList &attr, 376 QualType type) { 377 Declarator &declarator = state.getDeclarator(); 378 379 // Move it to the outermost normal or block pointer declarator. 380 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 381 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 382 switch (chunk.Kind) { 383 case DeclaratorChunk::Pointer: 384 case DeclaratorChunk::BlockPointer: { 385 // But don't move an ARC ownership attribute to the return type 386 // of a block. 387 DeclaratorChunk *destChunk = 0; 388 if (state.isProcessingDeclSpec() && 389 attr.getKind() == AttributeList::AT_ObjCOwnership) 390 destChunk = maybeMovePastReturnType(declarator, i - 1); 391 if (!destChunk) destChunk = &chunk; 392 393 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 394 destChunk->getAttrListRef()); 395 return; 396 } 397 398 case DeclaratorChunk::Paren: 399 case DeclaratorChunk::Array: 400 continue; 401 402 // We may be starting at the return type of a block. 403 case DeclaratorChunk::Function: 404 if (state.isProcessingDeclSpec() && 405 attr.getKind() == AttributeList::AT_ObjCOwnership) { 406 if (DeclaratorChunk *dest = maybeMovePastReturnType(declarator, i)) { 407 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 408 dest->getAttrListRef()); 409 return; 410 } 411 } 412 goto error; 413 414 // Don't walk through these. 415 case DeclaratorChunk::Reference: 416 case DeclaratorChunk::MemberPointer: 417 goto error; 418 } 419 } 420 error: 421 422 diagnoseBadTypeAttribute(state.getSema(), attr, type); 423} 424 425/// Distribute an objc_gc type attribute that was written on the 426/// declarator. 427static void 428distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 429 AttributeList &attr, 430 QualType &declSpecType) { 431 Declarator &declarator = state.getDeclarator(); 432 433 // objc_gc goes on the innermost pointer to something that's not a 434 // pointer. 435 unsigned innermost = -1U; 436 bool considerDeclSpec = true; 437 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 438 DeclaratorChunk &chunk = declarator.getTypeObject(i); 439 switch (chunk.Kind) { 440 case DeclaratorChunk::Pointer: 441 case DeclaratorChunk::BlockPointer: 442 innermost = i; 443 continue; 444 445 case DeclaratorChunk::Reference: 446 case DeclaratorChunk::MemberPointer: 447 case DeclaratorChunk::Paren: 448 case DeclaratorChunk::Array: 449 continue; 450 451 case DeclaratorChunk::Function: 452 considerDeclSpec = false; 453 goto done; 454 } 455 } 456 done: 457 458 // That might actually be the decl spec if we weren't blocked by 459 // anything in the declarator. 460 if (considerDeclSpec) { 461 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 462 // Splice the attribute into the decl spec. Prevents the 463 // attribute from being applied multiple times and gives 464 // the source-location-filler something to work with. 465 state.saveDeclSpecAttrs(); 466 moveAttrFromListToList(attr, declarator.getAttrListRef(), 467 declarator.getMutableDeclSpec().getAttributes().getListRef()); 468 return; 469 } 470 } 471 472 // Otherwise, if we found an appropriate chunk, splice the attribute 473 // into it. 474 if (innermost != -1U) { 475 moveAttrFromListToList(attr, declarator.getAttrListRef(), 476 declarator.getTypeObject(innermost).getAttrListRef()); 477 return; 478 } 479 480 // Otherwise, diagnose when we're done building the type. 481 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 482 state.addIgnoredTypeAttr(attr); 483} 484 485/// A function type attribute was written somewhere in a declaration 486/// *other* than on the declarator itself or in the decl spec. Given 487/// that it didn't apply in whatever position it was written in, try 488/// to move it to a more appropriate position. 489static void distributeFunctionTypeAttr(TypeProcessingState &state, 490 AttributeList &attr, 491 QualType type) { 492 Declarator &declarator = state.getDeclarator(); 493 494 // Try to push the attribute from the return type of a function to 495 // the function itself. 496 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 497 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 498 switch (chunk.Kind) { 499 case DeclaratorChunk::Function: 500 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 501 chunk.getAttrListRef()); 502 return; 503 504 case DeclaratorChunk::Paren: 505 case DeclaratorChunk::Pointer: 506 case DeclaratorChunk::BlockPointer: 507 case DeclaratorChunk::Array: 508 case DeclaratorChunk::Reference: 509 case DeclaratorChunk::MemberPointer: 510 continue; 511 } 512 } 513 514 diagnoseBadTypeAttribute(state.getSema(), attr, type); 515} 516 517/// Try to distribute a function type attribute to the innermost 518/// function chunk or type. Returns true if the attribute was 519/// distributed, false if no location was found. 520static bool 521distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 522 AttributeList &attr, 523 AttributeList *&attrList, 524 QualType &declSpecType) { 525 Declarator &declarator = state.getDeclarator(); 526 527 // Put it on the innermost function chunk, if there is one. 528 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 529 DeclaratorChunk &chunk = declarator.getTypeObject(i); 530 if (chunk.Kind != DeclaratorChunk::Function) continue; 531 532 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 533 return true; 534 } 535 536 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 537 spliceAttrOutOfList(attr, attrList); 538 return true; 539 } 540 541 return false; 542} 543 544/// A function type attribute was written in the decl spec. Try to 545/// apply it somewhere. 546static void 547distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 548 AttributeList &attr, 549 QualType &declSpecType) { 550 state.saveDeclSpecAttrs(); 551 552 // C++11 attributes before the decl specifiers actually appertain to 553 // the declarators. Move them straight there. We don't support the 554 // 'put them wherever you like' semantics we allow for GNU attributes. 555 if (attr.isCXX11Attribute()) { 556 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 557 state.getDeclarator().getAttrListRef()); 558 return; 559 } 560 561 // Try to distribute to the innermost. 562 if (distributeFunctionTypeAttrToInnermost(state, attr, 563 state.getCurrentAttrListRef(), 564 declSpecType)) 565 return; 566 567 // If that failed, diagnose the bad attribute when the declarator is 568 // fully built. 569 state.addIgnoredTypeAttr(attr); 570} 571 572/// A function type attribute was written on the declarator. Try to 573/// apply it somewhere. 574static void 575distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 576 AttributeList &attr, 577 QualType &declSpecType) { 578 Declarator &declarator = state.getDeclarator(); 579 580 // Try to distribute to the innermost. 581 if (distributeFunctionTypeAttrToInnermost(state, attr, 582 declarator.getAttrListRef(), 583 declSpecType)) 584 return; 585 586 // If that failed, diagnose the bad attribute when the declarator is 587 // fully built. 588 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 589 state.addIgnoredTypeAttr(attr); 590} 591 592/// \brief Given that there are attributes written on the declarator 593/// itself, try to distribute any type attributes to the appropriate 594/// declarator chunk. 595/// 596/// These are attributes like the following: 597/// int f ATTR; 598/// int (f ATTR)(); 599/// but not necessarily this: 600/// int f() ATTR; 601static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 602 QualType &declSpecType) { 603 // Collect all the type attributes from the declarator itself. 604 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 605 AttributeList *attr = state.getDeclarator().getAttributes(); 606 AttributeList *next; 607 do { 608 next = attr->getNext(); 609 610 // Do not distribute C++11 attributes. They have strict rules for what 611 // they appertain to. 612 if (attr->isCXX11Attribute()) 613 continue; 614 615 switch (attr->getKind()) { 616 OBJC_POINTER_TYPE_ATTRS_CASELIST: 617 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 618 break; 619 620 case AttributeList::AT_NSReturnsRetained: 621 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 622 break; 623 // fallthrough 624 625 FUNCTION_TYPE_ATTRS_CASELIST: 626 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 627 break; 628 629 default: 630 break; 631 } 632 } while ((attr = next)); 633} 634 635/// Add a synthetic '()' to a block-literal declarator if it is 636/// required, given the return type. 637static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 638 QualType declSpecType) { 639 Declarator &declarator = state.getDeclarator(); 640 641 // First, check whether the declarator would produce a function, 642 // i.e. whether the innermost semantic chunk is a function. 643 if (declarator.isFunctionDeclarator()) { 644 // If so, make that declarator a prototyped declarator. 645 declarator.getFunctionTypeInfo().hasPrototype = true; 646 return; 647 } 648 649 // If there are any type objects, the type as written won't name a 650 // function, regardless of the decl spec type. This is because a 651 // block signature declarator is always an abstract-declarator, and 652 // abstract-declarators can't just be parentheses chunks. Therefore 653 // we need to build a function chunk unless there are no type 654 // objects and the decl spec type is a function. 655 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 656 return; 657 658 // Note that there *are* cases with invalid declarators where 659 // declarators consist solely of parentheses. In general, these 660 // occur only in failed efforts to make function declarators, so 661 // faking up the function chunk is still the right thing to do. 662 663 // Otherwise, we need to fake up a function declarator. 664 SourceLocation loc = declarator.getLocStart(); 665 666 // ...and *prepend* it to the declarator. 667 SourceLocation NoLoc; 668 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 669 /*HasProto=*/true, 670 /*IsAmbiguous=*/false, 671 /*LParenLoc=*/NoLoc, 672 /*ArgInfo=*/0, 673 /*NumArgs=*/0, 674 /*EllipsisLoc=*/NoLoc, 675 /*RParenLoc=*/NoLoc, 676 /*TypeQuals=*/0, 677 /*RefQualifierIsLvalueRef=*/true, 678 /*RefQualifierLoc=*/NoLoc, 679 /*ConstQualifierLoc=*/NoLoc, 680 /*VolatileQualifierLoc=*/NoLoc, 681 /*MutableLoc=*/NoLoc, 682 EST_None, 683 /*ESpecLoc=*/NoLoc, 684 /*Exceptions=*/0, 685 /*ExceptionRanges=*/0, 686 /*NumExceptions=*/0, 687 /*NoexceptExpr=*/0, 688 loc, loc, declarator)); 689 690 // For consistency, make sure the state still has us as processing 691 // the decl spec. 692 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 693 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 694} 695 696/// \brief Convert the specified declspec to the appropriate type 697/// object. 698/// \param state Specifies the declarator containing the declaration specifier 699/// to be converted, along with other associated processing state. 700/// \returns The type described by the declaration specifiers. This function 701/// never returns null. 702static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 703 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 704 // checking. 705 706 Sema &S = state.getSema(); 707 Declarator &declarator = state.getDeclarator(); 708 const DeclSpec &DS = declarator.getDeclSpec(); 709 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 710 if (DeclLoc.isInvalid()) 711 DeclLoc = DS.getLocStart(); 712 713 ASTContext &Context = S.Context; 714 715 QualType Result; 716 switch (DS.getTypeSpecType()) { 717 case DeclSpec::TST_void: 718 Result = Context.VoidTy; 719 break; 720 case DeclSpec::TST_char: 721 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 722 Result = Context.CharTy; 723 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 724 Result = Context.SignedCharTy; 725 else { 726 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 727 "Unknown TSS value"); 728 Result = Context.UnsignedCharTy; 729 } 730 break; 731 case DeclSpec::TST_wchar: 732 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 733 Result = Context.WCharTy; 734 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 735 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 736 << DS.getSpecifierName(DS.getTypeSpecType()); 737 Result = Context.getSignedWCharType(); 738 } else { 739 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 740 "Unknown TSS value"); 741 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 742 << DS.getSpecifierName(DS.getTypeSpecType()); 743 Result = Context.getUnsignedWCharType(); 744 } 745 break; 746 case DeclSpec::TST_char16: 747 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 748 "Unknown TSS value"); 749 Result = Context.Char16Ty; 750 break; 751 case DeclSpec::TST_char32: 752 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 753 "Unknown TSS value"); 754 Result = Context.Char32Ty; 755 break; 756 case DeclSpec::TST_unspecified: 757 // "<proto1,proto2>" is an objc qualified ID with a missing id. 758 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 759 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 760 (ObjCProtocolDecl*const*)PQ, 761 DS.getNumProtocolQualifiers()); 762 Result = Context.getObjCObjectPointerType(Result); 763 break; 764 } 765 766 // If this is a missing declspec in a block literal return context, then it 767 // is inferred from the return statements inside the block. 768 // The declspec is always missing in a lambda expr context; it is either 769 // specified with a trailing return type or inferred. 770 if (declarator.getContext() == Declarator::LambdaExprContext || 771 isOmittedBlockReturnType(declarator)) { 772 Result = Context.DependentTy; 773 break; 774 } 775 776 // Unspecified typespec defaults to int in C90. However, the C90 grammar 777 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 778 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 779 // Note that the one exception to this is function definitions, which are 780 // allowed to be completely missing a declspec. This is handled in the 781 // parser already though by it pretending to have seen an 'int' in this 782 // case. 783 if (S.getLangOpts().ImplicitInt) { 784 // In C89 mode, we only warn if there is a completely missing declspec 785 // when one is not allowed. 786 if (DS.isEmpty()) { 787 S.Diag(DeclLoc, diag::ext_missing_declspec) 788 << DS.getSourceRange() 789 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 790 } 791 } else if (!DS.hasTypeSpecifier()) { 792 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 793 // "At least one type specifier shall be given in the declaration 794 // specifiers in each declaration, and in the specifier-qualifier list in 795 // each struct declaration and type name." 796 // FIXME: Does Microsoft really have the implicit int extension in C++? 797 if (S.getLangOpts().CPlusPlus && 798 !S.getLangOpts().MicrosoftExt) { 799 S.Diag(DeclLoc, diag::err_missing_type_specifier) 800 << DS.getSourceRange(); 801 802 // When this occurs in C++ code, often something is very broken with the 803 // value being declared, poison it as invalid so we don't get chains of 804 // errors. 805 declarator.setInvalidType(true); 806 } else { 807 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 808 << DS.getSourceRange(); 809 } 810 } 811 812 // FALL THROUGH. 813 case DeclSpec::TST_int: { 814 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 815 switch (DS.getTypeSpecWidth()) { 816 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 817 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 818 case DeclSpec::TSW_long: Result = Context.LongTy; break; 819 case DeclSpec::TSW_longlong: 820 Result = Context.LongLongTy; 821 822 // 'long long' is a C99 or C++11 feature. 823 if (!S.getLangOpts().C99) { 824 if (S.getLangOpts().CPlusPlus) 825 S.Diag(DS.getTypeSpecWidthLoc(), 826 S.getLangOpts().CPlusPlus11 ? 827 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 828 else 829 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 830 } 831 break; 832 } 833 } else { 834 switch (DS.getTypeSpecWidth()) { 835 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 836 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 837 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 838 case DeclSpec::TSW_longlong: 839 Result = Context.UnsignedLongLongTy; 840 841 // 'long long' is a C99 or C++11 feature. 842 if (!S.getLangOpts().C99) { 843 if (S.getLangOpts().CPlusPlus) 844 S.Diag(DS.getTypeSpecWidthLoc(), 845 S.getLangOpts().CPlusPlus11 ? 846 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 847 else 848 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 849 } 850 break; 851 } 852 } 853 break; 854 } 855 case DeclSpec::TST_int128: 856 if (!S.PP.getTargetInfo().hasInt128Type()) 857 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported); 858 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 859 Result = Context.UnsignedInt128Ty; 860 else 861 Result = Context.Int128Ty; 862 break; 863 case DeclSpec::TST_half: Result = Context.HalfTy; break; 864 case DeclSpec::TST_float: Result = Context.FloatTy; break; 865 case DeclSpec::TST_double: 866 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 867 Result = Context.LongDoubleTy; 868 else 869 Result = Context.DoubleTy; 870 871 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 872 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 873 declarator.setInvalidType(true); 874 } 875 break; 876 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 877 case DeclSpec::TST_decimal32: // _Decimal32 878 case DeclSpec::TST_decimal64: // _Decimal64 879 case DeclSpec::TST_decimal128: // _Decimal128 880 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 881 Result = Context.IntTy; 882 declarator.setInvalidType(true); 883 break; 884 case DeclSpec::TST_class: 885 case DeclSpec::TST_enum: 886 case DeclSpec::TST_union: 887 case DeclSpec::TST_struct: 888 case DeclSpec::TST_interface: { 889 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 890 if (!D) { 891 // This can happen in C++ with ambiguous lookups. 892 Result = Context.IntTy; 893 declarator.setInvalidType(true); 894 break; 895 } 896 897 // If the type is deprecated or unavailable, diagnose it. 898 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 899 900 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 901 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 902 903 // TypeQuals handled by caller. 904 Result = Context.getTypeDeclType(D); 905 906 // In both C and C++, make an ElaboratedType. 907 ElaboratedTypeKeyword Keyword 908 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 909 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 910 break; 911 } 912 case DeclSpec::TST_typename: { 913 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 914 DS.getTypeSpecSign() == 0 && 915 "Can't handle qualifiers on typedef names yet!"); 916 Result = S.GetTypeFromParser(DS.getRepAsType()); 917 if (Result.isNull()) 918 declarator.setInvalidType(true); 919 else if (DeclSpec::ProtocolQualifierListTy PQ 920 = DS.getProtocolQualifiers()) { 921 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 922 // Silently drop any existing protocol qualifiers. 923 // TODO: determine whether that's the right thing to do. 924 if (ObjT->getNumProtocols()) 925 Result = ObjT->getBaseType(); 926 927 if (DS.getNumProtocolQualifiers()) 928 Result = Context.getObjCObjectType(Result, 929 (ObjCProtocolDecl*const*) PQ, 930 DS.getNumProtocolQualifiers()); 931 } else if (Result->isObjCIdType()) { 932 // id<protocol-list> 933 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 934 (ObjCProtocolDecl*const*) PQ, 935 DS.getNumProtocolQualifiers()); 936 Result = Context.getObjCObjectPointerType(Result); 937 } else if (Result->isObjCClassType()) { 938 // Class<protocol-list> 939 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 940 (ObjCProtocolDecl*const*) PQ, 941 DS.getNumProtocolQualifiers()); 942 Result = Context.getObjCObjectPointerType(Result); 943 } else { 944 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 945 << DS.getSourceRange(); 946 declarator.setInvalidType(true); 947 } 948 } 949 950 // TypeQuals handled by caller. 951 break; 952 } 953 case DeclSpec::TST_typeofType: 954 // FIXME: Preserve type source info. 955 Result = S.GetTypeFromParser(DS.getRepAsType()); 956 assert(!Result.isNull() && "Didn't get a type for typeof?"); 957 if (!Result->isDependentType()) 958 if (const TagType *TT = Result->getAs<TagType>()) 959 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 960 // TypeQuals handled by caller. 961 Result = Context.getTypeOfType(Result); 962 break; 963 case DeclSpec::TST_typeofExpr: { 964 Expr *E = DS.getRepAsExpr(); 965 assert(E && "Didn't get an expression for typeof?"); 966 // TypeQuals handled by caller. 967 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 968 if (Result.isNull()) { 969 Result = Context.IntTy; 970 declarator.setInvalidType(true); 971 } 972 break; 973 } 974 case DeclSpec::TST_decltype: { 975 Expr *E = DS.getRepAsExpr(); 976 assert(E && "Didn't get an expression for decltype?"); 977 // TypeQuals handled by caller. 978 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 979 if (Result.isNull()) { 980 Result = Context.IntTy; 981 declarator.setInvalidType(true); 982 } 983 break; 984 } 985 case DeclSpec::TST_underlyingType: 986 Result = S.GetTypeFromParser(DS.getRepAsType()); 987 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 988 Result = S.BuildUnaryTransformType(Result, 989 UnaryTransformType::EnumUnderlyingType, 990 DS.getTypeSpecTypeLoc()); 991 if (Result.isNull()) { 992 Result = Context.IntTy; 993 declarator.setInvalidType(true); 994 } 995 break; 996 997 case DeclSpec::TST_auto: { 998 // TypeQuals handled by caller. 999 Result = Context.getAutoType(QualType()); 1000 break; 1001 } 1002 1003 case DeclSpec::TST_unknown_anytype: 1004 Result = Context.UnknownAnyTy; 1005 break; 1006 1007 case DeclSpec::TST_atomic: 1008 Result = S.GetTypeFromParser(DS.getRepAsType()); 1009 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 1010 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 1011 if (Result.isNull()) { 1012 Result = Context.IntTy; 1013 declarator.setInvalidType(true); 1014 } 1015 break; 1016 1017 case DeclSpec::TST_image1d_t: 1018 Result = Context.OCLImage1dTy; 1019 break; 1020 1021 case DeclSpec::TST_image1d_array_t: 1022 Result = Context.OCLImage1dArrayTy; 1023 break; 1024 1025 case DeclSpec::TST_image1d_buffer_t: 1026 Result = Context.OCLImage1dBufferTy; 1027 break; 1028 1029 case DeclSpec::TST_image2d_t: 1030 Result = Context.OCLImage2dTy; 1031 break; 1032 1033 case DeclSpec::TST_image2d_array_t: 1034 Result = Context.OCLImage2dArrayTy; 1035 break; 1036 1037 case DeclSpec::TST_image3d_t: 1038 Result = Context.OCLImage3dTy; 1039 break; 1040 1041 case DeclSpec::TST_sampler_t: 1042 Result = Context.OCLSamplerTy; 1043 break; 1044 1045 case DeclSpec::TST_event_t: 1046 Result = Context.OCLEventTy; 1047 break; 1048 1049 case DeclSpec::TST_error: 1050 Result = Context.IntTy; 1051 declarator.setInvalidType(true); 1052 break; 1053 } 1054 1055 // Handle complex types. 1056 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 1057 if (S.getLangOpts().Freestanding) 1058 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 1059 Result = Context.getComplexType(Result); 1060 } else if (DS.isTypeAltiVecVector()) { 1061 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 1062 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 1063 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 1064 if (DS.isTypeAltiVecPixel()) 1065 VecKind = VectorType::AltiVecPixel; 1066 else if (DS.isTypeAltiVecBool()) 1067 VecKind = VectorType::AltiVecBool; 1068 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 1069 } 1070 1071 // FIXME: Imaginary. 1072 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 1073 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 1074 1075 // Before we process any type attributes, synthesize a block literal 1076 // function declarator if necessary. 1077 if (declarator.getContext() == Declarator::BlockLiteralContext) 1078 maybeSynthesizeBlockSignature(state, Result); 1079 1080 // Apply any type attributes from the decl spec. This may cause the 1081 // list of type attributes to be temporarily saved while the type 1082 // attributes are pushed around. 1083 if (AttributeList *attrs = DS.getAttributes().getList()) 1084 processTypeAttrs(state, Result, TAL_DeclSpec, attrs); 1085 1086 // Apply const/volatile/restrict qualifiers to T. 1087 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1088 1089 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1090 // of a function type includes any type qualifiers, the behavior is 1091 // undefined." 1092 if (Result->isFunctionType() && TypeQuals) { 1093 if (TypeQuals & DeclSpec::TQ_const) 1094 S.Diag(DS.getConstSpecLoc(), diag::warn_typecheck_function_qualifiers) 1095 << Result << DS.getSourceRange(); 1096 else if (TypeQuals & DeclSpec::TQ_volatile) 1097 S.Diag(DS.getVolatileSpecLoc(), diag::warn_typecheck_function_qualifiers) 1098 << Result << DS.getSourceRange(); 1099 else { 1100 assert((TypeQuals & (DeclSpec::TQ_restrict | DeclSpec::TQ_atomic)) && 1101 "Has CVRA quals but not C, V, R, or A?"); 1102 // No diagnostic; we'll diagnose 'restrict' or '_Atomic' applied to a 1103 // function type later, in BuildQualifiedType. 1104 } 1105 } 1106 1107 // C++ [dcl.ref]p1: 1108 // Cv-qualified references are ill-formed except when the 1109 // cv-qualifiers are introduced through the use of a typedef 1110 // (7.1.3) or of a template type argument (14.3), in which 1111 // case the cv-qualifiers are ignored. 1112 // FIXME: Shouldn't we be checking SCS_typedef here? 1113 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1114 TypeQuals && Result->isReferenceType()) { 1115 TypeQuals &= ~DeclSpec::TQ_const; 1116 TypeQuals &= ~DeclSpec::TQ_volatile; 1117 TypeQuals &= ~DeclSpec::TQ_atomic; 1118 } 1119 1120 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1121 // than once in the same specifier-list or qualifier-list, either directly 1122 // or via one or more typedefs." 1123 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1124 && TypeQuals & Result.getCVRQualifiers()) { 1125 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1126 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1127 << "const"; 1128 } 1129 1130 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1131 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1132 << "volatile"; 1133 } 1134 1135 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to 1136 // produce a warning in this case. 1137 } 1138 1139 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS); 1140 1141 // If adding qualifiers fails, just use the unqualified type. 1142 if (Qualified.isNull()) 1143 declarator.setInvalidType(true); 1144 else 1145 Result = Qualified; 1146 } 1147 1148 return Result; 1149} 1150 1151static std::string getPrintableNameForEntity(DeclarationName Entity) { 1152 if (Entity) 1153 return Entity.getAsString(); 1154 1155 return "type name"; 1156} 1157 1158QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1159 Qualifiers Qs, const DeclSpec *DS) { 1160 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1161 // object or incomplete types shall not be restrict-qualified." 1162 if (Qs.hasRestrict()) { 1163 unsigned DiagID = 0; 1164 QualType ProblemTy; 1165 1166 if (T->isAnyPointerType() || T->isReferenceType() || 1167 T->isMemberPointerType()) { 1168 QualType EltTy; 1169 if (T->isObjCObjectPointerType()) 1170 EltTy = T; 1171 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>()) 1172 EltTy = PTy->getPointeeType(); 1173 else 1174 EltTy = T->getPointeeType(); 1175 1176 // If we have a pointer or reference, the pointee must have an object 1177 // incomplete type. 1178 if (!EltTy->isIncompleteOrObjectType()) { 1179 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1180 ProblemTy = EltTy; 1181 } 1182 } else if (!T->isDependentType()) { 1183 DiagID = diag::err_typecheck_invalid_restrict_not_pointer; 1184 ProblemTy = T; 1185 } 1186 1187 if (DiagID) { 1188 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy; 1189 Qs.removeRestrict(); 1190 } 1191 } 1192 1193 return Context.getQualifiedType(T, Qs); 1194} 1195 1196QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1197 unsigned CVRA, const DeclSpec *DS) { 1198 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic. 1199 unsigned CVR = CVRA & ~DeclSpec::TQ_atomic; 1200 1201 // C11 6.7.3/5: 1202 // If the same qualifier appears more than once in the same 1203 // specifier-qualifier-list, either directly or via one or more typedefs, 1204 // the behavior is the same as if it appeared only once. 1205 // 1206 // It's not specified what happens when the _Atomic qualifier is applied to 1207 // a type specified with the _Atomic specifier, but we assume that this 1208 // should be treated as if the _Atomic qualifier appeared multiple times. 1209 if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) { 1210 // C11 6.7.3/5: 1211 // If other qualifiers appear along with the _Atomic qualifier in a 1212 // specifier-qualifier-list, the resulting type is the so-qualified 1213 // atomic type. 1214 // 1215 // Don't need to worry about array types here, since _Atomic can't be 1216 // applied to such types. 1217 SplitQualType Split = T.getSplitUnqualifiedType(); 1218 T = BuildAtomicType(QualType(Split.Ty, 0), 1219 DS ? DS->getAtomicSpecLoc() : Loc); 1220 if (T.isNull()) 1221 return T; 1222 Split.Quals.addCVRQualifiers(CVR); 1223 return BuildQualifiedType(T, Loc, Split.Quals); 1224 } 1225 1226 return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS); 1227} 1228 1229/// \brief Build a paren type including \p T. 1230QualType Sema::BuildParenType(QualType T) { 1231 return Context.getParenType(T); 1232} 1233 1234/// Given that we're building a pointer or reference to the given 1235static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1236 SourceLocation loc, 1237 bool isReference) { 1238 // Bail out if retention is unrequired or already specified. 1239 if (!type->isObjCLifetimeType() || 1240 type.getObjCLifetime() != Qualifiers::OCL_None) 1241 return type; 1242 1243 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1244 1245 // If the object type is const-qualified, we can safely use 1246 // __unsafe_unretained. This is safe (because there are no read 1247 // barriers), and it'll be safe to coerce anything but __weak* to 1248 // the resulting type. 1249 if (type.isConstQualified()) { 1250 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1251 1252 // Otherwise, check whether the static type does not require 1253 // retaining. This currently only triggers for Class (possibly 1254 // protocol-qualifed, and arrays thereof). 1255 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1256 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1257 1258 // If we are in an unevaluated context, like sizeof, skip adding a 1259 // qualification. 1260 } else if (S.isUnevaluatedContext()) { 1261 return type; 1262 1263 // If that failed, give an error and recover using __strong. __strong 1264 // is the option most likely to prevent spurious second-order diagnostics, 1265 // like when binding a reference to a field. 1266 } else { 1267 // These types can show up in private ivars in system headers, so 1268 // we need this to not be an error in those cases. Instead we 1269 // want to delay. 1270 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1271 S.DelayedDiagnostics.add( 1272 sema::DelayedDiagnostic::makeForbiddenType(loc, 1273 diag::err_arc_indirect_no_ownership, type, isReference)); 1274 } else { 1275 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1276 } 1277 implicitLifetime = Qualifiers::OCL_Strong; 1278 } 1279 assert(implicitLifetime && "didn't infer any lifetime!"); 1280 1281 Qualifiers qs; 1282 qs.addObjCLifetime(implicitLifetime); 1283 return S.Context.getQualifiedType(type, qs); 1284} 1285 1286/// \brief Build a pointer type. 1287/// 1288/// \param T The type to which we'll be building a pointer. 1289/// 1290/// \param Loc The location of the entity whose type involves this 1291/// pointer type or, if there is no such entity, the location of the 1292/// type that will have pointer type. 1293/// 1294/// \param Entity The name of the entity that involves the pointer 1295/// type, if known. 1296/// 1297/// \returns A suitable pointer type, if there are no 1298/// errors. Otherwise, returns a NULL type. 1299QualType Sema::BuildPointerType(QualType T, 1300 SourceLocation Loc, DeclarationName Entity) { 1301 if (T->isReferenceType()) { 1302 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1303 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1304 << getPrintableNameForEntity(Entity) << T; 1305 return QualType(); 1306 } 1307 1308 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1309 1310 // In ARC, it is forbidden to build pointers to unqualified pointers. 1311 if (getLangOpts().ObjCAutoRefCount) 1312 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1313 1314 // Build the pointer type. 1315 return Context.getPointerType(T); 1316} 1317 1318/// \brief Build a reference type. 1319/// 1320/// \param T The type to which we'll be building a reference. 1321/// 1322/// \param Loc The location of the entity whose type involves this 1323/// reference type or, if there is no such entity, the location of the 1324/// type that will have reference type. 1325/// 1326/// \param Entity The name of the entity that involves the reference 1327/// type, if known. 1328/// 1329/// \returns A suitable reference type, if there are no 1330/// errors. Otherwise, returns a NULL type. 1331QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1332 SourceLocation Loc, 1333 DeclarationName Entity) { 1334 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1335 "Unresolved overloaded function type"); 1336 1337 // C++0x [dcl.ref]p6: 1338 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1339 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1340 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1341 // the type "lvalue reference to T", while an attempt to create the type 1342 // "rvalue reference to cv TR" creates the type TR. 1343 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1344 1345 // C++ [dcl.ref]p4: There shall be no references to references. 1346 // 1347 // According to C++ DR 106, references to references are only 1348 // diagnosed when they are written directly (e.g., "int & &"), 1349 // but not when they happen via a typedef: 1350 // 1351 // typedef int& intref; 1352 // typedef intref& intref2; 1353 // 1354 // Parser::ParseDeclaratorInternal diagnoses the case where 1355 // references are written directly; here, we handle the 1356 // collapsing of references-to-references as described in C++0x. 1357 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1358 1359 // C++ [dcl.ref]p1: 1360 // A declarator that specifies the type "reference to cv void" 1361 // is ill-formed. 1362 if (T->isVoidType()) { 1363 Diag(Loc, diag::err_reference_to_void); 1364 return QualType(); 1365 } 1366 1367 // In ARC, it is forbidden to build references to unqualified pointers. 1368 if (getLangOpts().ObjCAutoRefCount) 1369 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1370 1371 // Handle restrict on references. 1372 if (LValueRef) 1373 return Context.getLValueReferenceType(T, SpelledAsLValue); 1374 return Context.getRValueReferenceType(T); 1375} 1376 1377/// Check whether the specified array size makes the array type a VLA. If so, 1378/// return true, if not, return the size of the array in SizeVal. 1379static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1380 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1381 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1382 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1383 public: 1384 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1385 1386 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1387 } 1388 1389 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1390 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1391 } 1392 } Diagnoser; 1393 1394 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1395 S.LangOpts.GNUMode).isInvalid(); 1396} 1397 1398 1399/// \brief Build an array type. 1400/// 1401/// \param T The type of each element in the array. 1402/// 1403/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1404/// 1405/// \param ArraySize Expression describing the size of the array. 1406/// 1407/// \param Brackets The range from the opening '[' to the closing ']'. 1408/// 1409/// \param Entity The name of the entity that involves the array 1410/// type, if known. 1411/// 1412/// \returns A suitable array type, if there are no errors. Otherwise, 1413/// returns a NULL type. 1414QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1415 Expr *ArraySize, unsigned Quals, 1416 SourceRange Brackets, DeclarationName Entity) { 1417 1418 SourceLocation Loc = Brackets.getBegin(); 1419 if (getLangOpts().CPlusPlus) { 1420 // C++ [dcl.array]p1: 1421 // T is called the array element type; this type shall not be a reference 1422 // type, the (possibly cv-qualified) type void, a function type or an 1423 // abstract class type. 1424 // 1425 // C++ [dcl.array]p3: 1426 // When several "array of" specifications are adjacent, [...] only the 1427 // first of the constant expressions that specify the bounds of the arrays 1428 // may be omitted. 1429 // 1430 // Note: function types are handled in the common path with C. 1431 if (T->isReferenceType()) { 1432 Diag(Loc, diag::err_illegal_decl_array_of_references) 1433 << getPrintableNameForEntity(Entity) << T; 1434 return QualType(); 1435 } 1436 1437 if (T->isVoidType() || T->isIncompleteArrayType()) { 1438 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1439 return QualType(); 1440 } 1441 1442 if (RequireNonAbstractType(Brackets.getBegin(), T, 1443 diag::err_array_of_abstract_type)) 1444 return QualType(); 1445 1446 } else { 1447 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1448 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1449 if (RequireCompleteType(Loc, T, 1450 diag::err_illegal_decl_array_incomplete_type)) 1451 return QualType(); 1452 } 1453 1454 if (T->isFunctionType()) { 1455 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1456 << getPrintableNameForEntity(Entity) << T; 1457 return QualType(); 1458 } 1459 1460 if (T->getContainedAutoType()) { 1461 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1462 << getPrintableNameForEntity(Entity) << T; 1463 return QualType(); 1464 } 1465 1466 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1467 // If the element type is a struct or union that contains a variadic 1468 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1469 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1470 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1471 } else if (T->isObjCObjectType()) { 1472 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1473 return QualType(); 1474 } 1475 1476 // Do placeholder conversions on the array size expression. 1477 if (ArraySize && ArraySize->hasPlaceholderType()) { 1478 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1479 if (Result.isInvalid()) return QualType(); 1480 ArraySize = Result.take(); 1481 } 1482 1483 // Do lvalue-to-rvalue conversions on the array size expression. 1484 if (ArraySize && !ArraySize->isRValue()) { 1485 ExprResult Result = DefaultLvalueConversion(ArraySize); 1486 if (Result.isInvalid()) 1487 return QualType(); 1488 1489 ArraySize = Result.take(); 1490 } 1491 1492 // C99 6.7.5.2p1: The size expression shall have integer type. 1493 // C++11 allows contextual conversions to such types. 1494 if (!getLangOpts().CPlusPlus11 && 1495 ArraySize && !ArraySize->isTypeDependent() && 1496 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1497 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1498 << ArraySize->getType() << ArraySize->getSourceRange(); 1499 return QualType(); 1500 } 1501 1502 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1503 if (!ArraySize) { 1504 if (ASM == ArrayType::Star) 1505 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1506 else 1507 T = Context.getIncompleteArrayType(T, ASM, Quals); 1508 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1509 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1510 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1511 !T->isConstantSizeType()) || 1512 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1513 // Even in C++11, don't allow contextual conversions in the array bound 1514 // of a VLA. 1515 if (getLangOpts().CPlusPlus11 && 1516 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1517 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1518 << ArraySize->getType() << ArraySize->getSourceRange(); 1519 return QualType(); 1520 } 1521 1522 // C99: an array with an element type that has a non-constant-size is a VLA. 1523 // C99: an array with a non-ICE size is a VLA. We accept any expression 1524 // that we can fold to a non-zero positive value as an extension. 1525 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1526 } else { 1527 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1528 // have a value greater than zero. 1529 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1530 if (Entity) 1531 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1532 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1533 else 1534 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1535 << ArraySize->getSourceRange(); 1536 return QualType(); 1537 } 1538 if (ConstVal == 0) { 1539 // GCC accepts zero sized static arrays. We allow them when 1540 // we're not in a SFINAE context. 1541 Diag(ArraySize->getLocStart(), 1542 isSFINAEContext()? diag::err_typecheck_zero_array_size 1543 : diag::ext_typecheck_zero_array_size) 1544 << ArraySize->getSourceRange(); 1545 1546 if (ASM == ArrayType::Static) { 1547 Diag(ArraySize->getLocStart(), 1548 diag::warn_typecheck_zero_static_array_size) 1549 << ArraySize->getSourceRange(); 1550 ASM = ArrayType::Normal; 1551 } 1552 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1553 !T->isIncompleteType()) { 1554 // Is the array too large? 1555 unsigned ActiveSizeBits 1556 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1557 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1558 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1559 << ConstVal.toString(10) 1560 << ArraySize->getSourceRange(); 1561 } 1562 1563 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1564 } 1565 1566 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1567 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1568 Diag(Loc, diag::err_opencl_vla); 1569 return QualType(); 1570 } 1571 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1572 if (!getLangOpts().C99) { 1573 if (T->isVariableArrayType()) { 1574 // Prohibit the use of non-POD types in VLAs. 1575 QualType BaseT = Context.getBaseElementType(T); 1576 if (!T->isDependentType() && 1577 !BaseT.isPODType(Context) && 1578 !BaseT->isObjCLifetimeType()) { 1579 Diag(Loc, diag::err_vla_non_pod) 1580 << BaseT; 1581 return QualType(); 1582 } 1583 // Prohibit the use of VLAs during template argument deduction. 1584 else if (isSFINAEContext()) { 1585 Diag(Loc, diag::err_vla_in_sfinae); 1586 return QualType(); 1587 } 1588 // Just extwarn about VLAs. 1589 else 1590 Diag(Loc, diag::ext_vla); 1591 } else if (ASM != ArrayType::Normal || Quals != 0) 1592 Diag(Loc, 1593 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1594 : diag::ext_c99_array_usage) << ASM; 1595 } 1596 1597 if (T->isVariableArrayType()) { 1598 // Warn about VLAs for -Wvla. 1599 Diag(Loc, diag::warn_vla_used); 1600 } 1601 1602 return T; 1603} 1604 1605/// \brief Build an ext-vector type. 1606/// 1607/// Run the required checks for the extended vector type. 1608QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1609 SourceLocation AttrLoc) { 1610 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1611 // in conjunction with complex types (pointers, arrays, functions, etc.). 1612 if (!T->isDependentType() && 1613 !T->isIntegerType() && !T->isRealFloatingType()) { 1614 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1615 return QualType(); 1616 } 1617 1618 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1619 llvm::APSInt vecSize(32); 1620 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1621 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1622 << "ext_vector_type" << ArraySize->getSourceRange(); 1623 return QualType(); 1624 } 1625 1626 // unlike gcc's vector_size attribute, the size is specified as the 1627 // number of elements, not the number of bytes. 1628 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1629 1630 if (vectorSize == 0) { 1631 Diag(AttrLoc, diag::err_attribute_zero_size) 1632 << ArraySize->getSourceRange(); 1633 return QualType(); 1634 } 1635 1636 return Context.getExtVectorType(T, vectorSize); 1637 } 1638 1639 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1640} 1641 1642QualType Sema::BuildFunctionType(QualType T, 1643 llvm::MutableArrayRef<QualType> ParamTypes, 1644 SourceLocation Loc, DeclarationName Entity, 1645 const FunctionProtoType::ExtProtoInfo &EPI) { 1646 if (T->isArrayType() || T->isFunctionType()) { 1647 Diag(Loc, diag::err_func_returning_array_function) 1648 << T->isFunctionType() << T; 1649 return QualType(); 1650 } 1651 1652 // Functions cannot return half FP. 1653 if (T->isHalfType()) { 1654 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1655 FixItHint::CreateInsertion(Loc, "*"); 1656 return QualType(); 1657 } 1658 1659 bool Invalid = false; 1660 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) { 1661 // FIXME: Loc is too inprecise here, should use proper locations for args. 1662 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1663 if (ParamType->isVoidType()) { 1664 Diag(Loc, diag::err_param_with_void_type); 1665 Invalid = true; 1666 } else if (ParamType->isHalfType()) { 1667 // Disallow half FP arguments. 1668 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1669 FixItHint::CreateInsertion(Loc, "*"); 1670 Invalid = true; 1671 } 1672 1673 ParamTypes[Idx] = ParamType; 1674 } 1675 1676 if (Invalid) 1677 return QualType(); 1678 1679 return Context.getFunctionType(T, ParamTypes, EPI); 1680} 1681 1682/// \brief Build a member pointer type \c T Class::*. 1683/// 1684/// \param T the type to which the member pointer refers. 1685/// \param Class the class type into which the member pointer points. 1686/// \param Loc the location where this type begins 1687/// \param Entity the name of the entity that will have this member pointer type 1688/// 1689/// \returns a member pointer type, if successful, or a NULL type if there was 1690/// an error. 1691QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1692 SourceLocation Loc, 1693 DeclarationName Entity) { 1694 // Verify that we're not building a pointer to pointer to function with 1695 // exception specification. 1696 if (CheckDistantExceptionSpec(T)) { 1697 Diag(Loc, diag::err_distant_exception_spec); 1698 1699 // FIXME: If we're doing this as part of template instantiation, 1700 // we should return immediately. 1701 1702 // Build the type anyway, but use the canonical type so that the 1703 // exception specifiers are stripped off. 1704 T = Context.getCanonicalType(T); 1705 } 1706 1707 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1708 // with reference type, or "cv void." 1709 if (T->isReferenceType()) { 1710 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1711 << (Entity? Entity.getAsString() : "type name") << T; 1712 return QualType(); 1713 } 1714 1715 if (T->isVoidType()) { 1716 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1717 << (Entity? Entity.getAsString() : "type name"); 1718 return QualType(); 1719 } 1720 1721 if (!Class->isDependentType() && !Class->isRecordType()) { 1722 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1723 return QualType(); 1724 } 1725 1726 // C++ allows the class type in a member pointer to be an incomplete type. 1727 // In the Microsoft ABI, the size of the member pointer can vary 1728 // according to the class type, which means that we really need a 1729 // complete type if possible, which means we need to instantiate templates. 1730 // 1731 // If template instantiation fails or the type is just incomplete, we have to 1732 // add an extra slot to the member pointer. Yes, this does cause problems 1733 // when passing pointers between TUs that disagree about the size. 1734 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { 1735 CXXRecordDecl *RD = Class->getAsCXXRecordDecl(); 1736 if (!RD->hasAttr<MSInheritanceAttr>()) { 1737 // Lock in the inheritance model on the first use of a member pointer. 1738 // Otherwise we may disagree about the size at different points in the TU. 1739 // FIXME: MSVC picks a model on the first use that needs to know the size, 1740 // rather than on the first mention of the type, e.g. typedefs. 1741 SourceRange DeclRange = RD->getSourceRange(); 1742 if (RequireCompleteType(Loc, Class, 0) && !RD->isBeingDefined()) { 1743 // We know it doesn't have an attribute and it's incomplete, so use the 1744 // unspecified inheritance model. If we're in the record body, we can 1745 // figure out the inheritance model. 1746 for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(), 1747 E = RD->redecls_end(); I != E; ++I) { 1748 I->addAttr(::new (Context) UnspecifiedInheritanceAttr( 1749 RD->getSourceRange(), Context)); 1750 } 1751 } 1752 } 1753 } 1754 1755 return Context.getMemberPointerType(T, Class.getTypePtr()); 1756} 1757 1758/// \brief Build a block pointer type. 1759/// 1760/// \param T The type to which we'll be building a block pointer. 1761/// 1762/// \param Loc The source location, used for diagnostics. 1763/// 1764/// \param Entity The name of the entity that involves the block pointer 1765/// type, if known. 1766/// 1767/// \returns A suitable block pointer type, if there are no 1768/// errors. Otherwise, returns a NULL type. 1769QualType Sema::BuildBlockPointerType(QualType T, 1770 SourceLocation Loc, 1771 DeclarationName Entity) { 1772 if (!T->isFunctionType()) { 1773 Diag(Loc, diag::err_nonfunction_block_type); 1774 return QualType(); 1775 } 1776 1777 return Context.getBlockPointerType(T); 1778} 1779 1780QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1781 QualType QT = Ty.get(); 1782 if (QT.isNull()) { 1783 if (TInfo) *TInfo = 0; 1784 return QualType(); 1785 } 1786 1787 TypeSourceInfo *DI = 0; 1788 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1789 QT = LIT->getType(); 1790 DI = LIT->getTypeSourceInfo(); 1791 } 1792 1793 if (TInfo) *TInfo = DI; 1794 return QT; 1795} 1796 1797static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1798 Qualifiers::ObjCLifetime ownership, 1799 unsigned chunkIndex); 1800 1801/// Given that this is the declaration of a parameter under ARC, 1802/// attempt to infer attributes and such for pointer-to-whatever 1803/// types. 1804static void inferARCWriteback(TypeProcessingState &state, 1805 QualType &declSpecType) { 1806 Sema &S = state.getSema(); 1807 Declarator &declarator = state.getDeclarator(); 1808 1809 // TODO: should we care about decl qualifiers? 1810 1811 // Check whether the declarator has the expected form. We walk 1812 // from the inside out in order to make the block logic work. 1813 unsigned outermostPointerIndex = 0; 1814 bool isBlockPointer = false; 1815 unsigned numPointers = 0; 1816 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1817 unsigned chunkIndex = i; 1818 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1819 switch (chunk.Kind) { 1820 case DeclaratorChunk::Paren: 1821 // Ignore parens. 1822 break; 1823 1824 case DeclaratorChunk::Reference: 1825 case DeclaratorChunk::Pointer: 1826 // Count the number of pointers. Treat references 1827 // interchangeably as pointers; if they're mis-ordered, normal 1828 // type building will discover that. 1829 outermostPointerIndex = chunkIndex; 1830 numPointers++; 1831 break; 1832 1833 case DeclaratorChunk::BlockPointer: 1834 // If we have a pointer to block pointer, that's an acceptable 1835 // indirect reference; anything else is not an application of 1836 // the rules. 1837 if (numPointers != 1) return; 1838 numPointers++; 1839 outermostPointerIndex = chunkIndex; 1840 isBlockPointer = true; 1841 1842 // We don't care about pointer structure in return values here. 1843 goto done; 1844 1845 case DeclaratorChunk::Array: // suppress if written (id[])? 1846 case DeclaratorChunk::Function: 1847 case DeclaratorChunk::MemberPointer: 1848 return; 1849 } 1850 } 1851 done: 1852 1853 // If we have *one* pointer, then we want to throw the qualifier on 1854 // the declaration-specifiers, which means that it needs to be a 1855 // retainable object type. 1856 if (numPointers == 1) { 1857 // If it's not a retainable object type, the rule doesn't apply. 1858 if (!declSpecType->isObjCRetainableType()) return; 1859 1860 // If it already has lifetime, don't do anything. 1861 if (declSpecType.getObjCLifetime()) return; 1862 1863 // Otherwise, modify the type in-place. 1864 Qualifiers qs; 1865 1866 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1867 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1868 else 1869 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1870 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1871 1872 // If we have *two* pointers, then we want to throw the qualifier on 1873 // the outermost pointer. 1874 } else if (numPointers == 2) { 1875 // If we don't have a block pointer, we need to check whether the 1876 // declaration-specifiers gave us something that will turn into a 1877 // retainable object pointer after we slap the first pointer on it. 1878 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1879 return; 1880 1881 // Look for an explicit lifetime attribute there. 1882 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1883 if (chunk.Kind != DeclaratorChunk::Pointer && 1884 chunk.Kind != DeclaratorChunk::BlockPointer) 1885 return; 1886 for (const AttributeList *attr = chunk.getAttrs(); attr; 1887 attr = attr->getNext()) 1888 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1889 return; 1890 1891 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1892 outermostPointerIndex); 1893 1894 // Any other number of pointers/references does not trigger the rule. 1895 } else return; 1896 1897 // TODO: mark whether we did this inference? 1898} 1899 1900static void diagnoseIgnoredQualifiers( 1901 Sema &S, unsigned Quals, 1902 SourceLocation FallbackLoc, 1903 SourceLocation ConstQualLoc = SourceLocation(), 1904 SourceLocation VolatileQualLoc = SourceLocation(), 1905 SourceLocation RestrictQualLoc = SourceLocation(), 1906 SourceLocation AtomicQualLoc = SourceLocation()) { 1907 if (!Quals) 1908 return; 1909 1910 const SourceManager &SM = S.getSourceManager(); 1911 1912 struct Qual { 1913 unsigned Mask; 1914 const char *Name; 1915 SourceLocation Loc; 1916 } const QualKinds[4] = { 1917 { DeclSpec::TQ_const, "const", ConstQualLoc }, 1918 { DeclSpec::TQ_volatile, "volatile", VolatileQualLoc }, 1919 { DeclSpec::TQ_restrict, "restrict", RestrictQualLoc }, 1920 { DeclSpec::TQ_atomic, "_Atomic", AtomicQualLoc } 1921 }; 1922 1923 llvm::SmallString<32> QualStr; 1924 unsigned NumQuals = 0; 1925 SourceLocation Loc; 1926 FixItHint FixIts[4]; 1927 1928 // Build a string naming the redundant qualifiers. 1929 for (unsigned I = 0; I != 4; ++I) { 1930 if (Quals & QualKinds[I].Mask) { 1931 if (!QualStr.empty()) QualStr += ' '; 1932 QualStr += QualKinds[I].Name; 1933 1934 // If we have a location for the qualifier, offer a fixit. 1935 SourceLocation QualLoc = QualKinds[I].Loc; 1936 if (!QualLoc.isInvalid()) { 1937 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc); 1938 if (Loc.isInvalid() || SM.isBeforeInTranslationUnit(QualLoc, Loc)) 1939 Loc = QualLoc; 1940 } 1941 1942 ++NumQuals; 1943 } 1944 } 1945 1946 S.Diag(Loc.isInvalid() ? FallbackLoc : Loc, diag::warn_qual_return_type) 1947 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3]; 1948} 1949 1950// Diagnose pointless type qualifiers on the return type of a function. 1951static void diagnoseIgnoredFunctionQualifiers(Sema &S, QualType RetTy, 1952 Declarator &D, 1953 unsigned FunctionChunkIndex) { 1954 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) { 1955 // FIXME: TypeSourceInfo doesn't preserve location information for 1956 // qualifiers. 1957 diagnoseIgnoredQualifiers(S, RetTy.getLocalCVRQualifiers(), 1958 D.getIdentifierLoc()); 1959 return; 1960 } 1961 1962 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1, 1963 End = D.getNumTypeObjects(); 1964 OuterChunkIndex != End; ++OuterChunkIndex) { 1965 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex); 1966 switch (OuterChunk.Kind) { 1967 case DeclaratorChunk::Paren: 1968 continue; 1969 1970 case DeclaratorChunk::Pointer: { 1971 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr; 1972 diagnoseIgnoredQualifiers( 1973 S, PTI.TypeQuals, 1974 SourceLocation(), 1975 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 1976 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 1977 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 1978 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc)); 1979 return; 1980 } 1981 1982 case DeclaratorChunk::Function: 1983 case DeclaratorChunk::BlockPointer: 1984 case DeclaratorChunk::Reference: 1985 case DeclaratorChunk::Array: 1986 case DeclaratorChunk::MemberPointer: 1987 // FIXME: We can't currently provide an accurate source location and a 1988 // fix-it hint for these. 1989 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0; 1990 diagnoseIgnoredQualifiers(S, RetTy.getCVRQualifiers() | AtomicQual, 1991 D.getIdentifierLoc()); 1992 return; 1993 } 1994 1995 llvm_unreachable("unknown declarator chunk kind"); 1996 } 1997 1998 // If the qualifiers come from a conversion function type, don't diagnose 1999 // them -- they're not necessarily redundant, since such a conversion 2000 // operator can be explicitly called as "x.operator const int()". 2001 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) 2002 return; 2003 2004 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers 2005 // which are present there. 2006 diagnoseIgnoredQualifiers(S, D.getDeclSpec().getTypeQualifiers(), 2007 D.getIdentifierLoc(), 2008 D.getDeclSpec().getConstSpecLoc(), 2009 D.getDeclSpec().getVolatileSpecLoc(), 2010 D.getDeclSpec().getRestrictSpecLoc(), 2011 D.getDeclSpec().getAtomicSpecLoc()); 2012} 2013 2014static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 2015 TypeSourceInfo *&ReturnTypeInfo) { 2016 Sema &SemaRef = state.getSema(); 2017 Declarator &D = state.getDeclarator(); 2018 QualType T; 2019 ReturnTypeInfo = 0; 2020 2021 // The TagDecl owned by the DeclSpec. 2022 TagDecl *OwnedTagDecl = 0; 2023 2024 switch (D.getName().getKind()) { 2025 case UnqualifiedId::IK_ImplicitSelfParam: 2026 case UnqualifiedId::IK_OperatorFunctionId: 2027 case UnqualifiedId::IK_Identifier: 2028 case UnqualifiedId::IK_LiteralOperatorId: 2029 case UnqualifiedId::IK_TemplateId: 2030 T = ConvertDeclSpecToType(state); 2031 2032 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 2033 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2034 // Owned declaration is embedded in declarator. 2035 OwnedTagDecl->setEmbeddedInDeclarator(true); 2036 } 2037 break; 2038 2039 case UnqualifiedId::IK_ConstructorName: 2040 case UnqualifiedId::IK_ConstructorTemplateId: 2041 case UnqualifiedId::IK_DestructorName: 2042 // Constructors and destructors don't have return types. Use 2043 // "void" instead. 2044 T = SemaRef.Context.VoidTy; 2045 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 2046 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 2047 break; 2048 2049 case UnqualifiedId::IK_ConversionFunctionId: 2050 // The result type of a conversion function is the type that it 2051 // converts to. 2052 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 2053 &ReturnTypeInfo); 2054 break; 2055 } 2056 2057 if (D.getAttributes()) 2058 distributeTypeAttrsFromDeclarator(state, T); 2059 2060 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 2061 // In C++11, a function declarator using 'auto' must have a trailing return 2062 // type (this is checked later) and we can skip this. In other languages 2063 // using auto, we need to check regardless. 2064 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2065 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 2066 int Error = -1; 2067 2068 switch (D.getContext()) { 2069 case Declarator::KNRTypeListContext: 2070 llvm_unreachable("K&R type lists aren't allowed in C++"); 2071 case Declarator::LambdaExprContext: 2072 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 2073 case Declarator::ObjCParameterContext: 2074 case Declarator::ObjCResultContext: 2075 case Declarator::PrototypeContext: 2076 Error = 0; // Function prototype 2077 break; 2078 case Declarator::MemberContext: 2079 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 2080 break; 2081 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 2082 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 2083 case TTK_Struct: Error = 1; /* Struct member */ break; 2084 case TTK_Union: Error = 2; /* Union member */ break; 2085 case TTK_Class: Error = 3; /* Class member */ break; 2086 case TTK_Interface: Error = 4; /* Interface member */ break; 2087 } 2088 break; 2089 case Declarator::CXXCatchContext: 2090 case Declarator::ObjCCatchContext: 2091 Error = 5; // Exception declaration 2092 break; 2093 case Declarator::TemplateParamContext: 2094 Error = 6; // Template parameter 2095 break; 2096 case Declarator::BlockLiteralContext: 2097 Error = 7; // Block literal 2098 break; 2099 case Declarator::TemplateTypeArgContext: 2100 Error = 8; // Template type argument 2101 break; 2102 case Declarator::AliasDeclContext: 2103 case Declarator::AliasTemplateContext: 2104 Error = 10; // Type alias 2105 break; 2106 case Declarator::TrailingReturnContext: 2107 Error = 11; // Function return type 2108 break; 2109 case Declarator::TypeNameContext: 2110 Error = 12; // Generic 2111 break; 2112 case Declarator::FileContext: 2113 case Declarator::BlockContext: 2114 case Declarator::ForContext: 2115 case Declarator::ConditionContext: 2116 case Declarator::CXXNewContext: 2117 break; 2118 } 2119 2120 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2121 Error = 9; 2122 2123 // In Objective-C it is an error to use 'auto' on a function declarator. 2124 if (D.isFunctionDeclarator()) 2125 Error = 11; 2126 2127 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 2128 // contains a trailing return type. That is only legal at the outermost 2129 // level. Check all declarator chunks (outermost first) anyway, to give 2130 // better diagnostics. 2131 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 2132 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2133 unsigned chunkIndex = e - i - 1; 2134 state.setCurrentChunkIndex(chunkIndex); 2135 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2136 if (DeclType.Kind == DeclaratorChunk::Function) { 2137 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2138 if (FTI.hasTrailingReturnType()) { 2139 Error = -1; 2140 break; 2141 } 2142 } 2143 } 2144 } 2145 2146 if (Error != -1) { 2147 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2148 diag::err_auto_not_allowed) 2149 << Error; 2150 T = SemaRef.Context.IntTy; 2151 D.setInvalidType(true); 2152 } else 2153 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2154 diag::warn_cxx98_compat_auto_type_specifier); 2155 } 2156 2157 if (SemaRef.getLangOpts().CPlusPlus && 2158 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2159 // Check the contexts where C++ forbids the declaration of a new class 2160 // or enumeration in a type-specifier-seq. 2161 switch (D.getContext()) { 2162 case Declarator::TrailingReturnContext: 2163 // Class and enumeration definitions are syntactically not allowed in 2164 // trailing return types. 2165 llvm_unreachable("parser should not have allowed this"); 2166 break; 2167 case Declarator::FileContext: 2168 case Declarator::MemberContext: 2169 case Declarator::BlockContext: 2170 case Declarator::ForContext: 2171 case Declarator::BlockLiteralContext: 2172 case Declarator::LambdaExprContext: 2173 // C++11 [dcl.type]p3: 2174 // A type-specifier-seq shall not define a class or enumeration unless 2175 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2176 // the declaration of a template-declaration. 2177 case Declarator::AliasDeclContext: 2178 break; 2179 case Declarator::AliasTemplateContext: 2180 SemaRef.Diag(OwnedTagDecl->getLocation(), 2181 diag::err_type_defined_in_alias_template) 2182 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2183 D.setInvalidType(true); 2184 break; 2185 case Declarator::TypeNameContext: 2186 case Declarator::TemplateParamContext: 2187 case Declarator::CXXNewContext: 2188 case Declarator::CXXCatchContext: 2189 case Declarator::ObjCCatchContext: 2190 case Declarator::TemplateTypeArgContext: 2191 SemaRef.Diag(OwnedTagDecl->getLocation(), 2192 diag::err_type_defined_in_type_specifier) 2193 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2194 D.setInvalidType(true); 2195 break; 2196 case Declarator::PrototypeContext: 2197 case Declarator::ObjCParameterContext: 2198 case Declarator::ObjCResultContext: 2199 case Declarator::KNRTypeListContext: 2200 // C++ [dcl.fct]p6: 2201 // Types shall not be defined in return or parameter types. 2202 SemaRef.Diag(OwnedTagDecl->getLocation(), 2203 diag::err_type_defined_in_param_type) 2204 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2205 D.setInvalidType(true); 2206 break; 2207 case Declarator::ConditionContext: 2208 // C++ 6.4p2: 2209 // The type-specifier-seq shall not contain typedef and shall not declare 2210 // a new class or enumeration. 2211 SemaRef.Diag(OwnedTagDecl->getLocation(), 2212 diag::err_type_defined_in_condition); 2213 D.setInvalidType(true); 2214 break; 2215 } 2216 } 2217 2218 return T; 2219} 2220 2221static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2222 std::string Quals = 2223 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2224 2225 switch (FnTy->getRefQualifier()) { 2226 case RQ_None: 2227 break; 2228 2229 case RQ_LValue: 2230 if (!Quals.empty()) 2231 Quals += ' '; 2232 Quals += '&'; 2233 break; 2234 2235 case RQ_RValue: 2236 if (!Quals.empty()) 2237 Quals += ' '; 2238 Quals += "&&"; 2239 break; 2240 } 2241 2242 return Quals; 2243} 2244 2245/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2246/// can be contained within the declarator chunk DeclType, and produce an 2247/// appropriate diagnostic if not. 2248static void checkQualifiedFunction(Sema &S, QualType T, 2249 DeclaratorChunk &DeclType) { 2250 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2251 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2252 // of a type. 2253 int DiagKind = -1; 2254 switch (DeclType.Kind) { 2255 case DeclaratorChunk::Paren: 2256 case DeclaratorChunk::MemberPointer: 2257 // These cases are permitted. 2258 return; 2259 case DeclaratorChunk::Array: 2260 case DeclaratorChunk::Function: 2261 // These cases don't allow function types at all; no need to diagnose the 2262 // qualifiers separately. 2263 return; 2264 case DeclaratorChunk::BlockPointer: 2265 DiagKind = 0; 2266 break; 2267 case DeclaratorChunk::Pointer: 2268 DiagKind = 1; 2269 break; 2270 case DeclaratorChunk::Reference: 2271 DiagKind = 2; 2272 break; 2273 } 2274 2275 assert(DiagKind != -1); 2276 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2277 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2278 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2279} 2280 2281/// Produce an approprioate diagnostic for an ambiguity between a function 2282/// declarator and a C++ direct-initializer. 2283static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2284 DeclaratorChunk &DeclType, QualType RT) { 2285 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2286 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2287 2288 // If the return type is void there is no ambiguity. 2289 if (RT->isVoidType()) 2290 return; 2291 2292 // An initializer for a non-class type can have at most one argument. 2293 if (!RT->isRecordType() && FTI.NumArgs > 1) 2294 return; 2295 2296 // An initializer for a reference must have exactly one argument. 2297 if (RT->isReferenceType() && FTI.NumArgs != 1) 2298 return; 2299 2300 // Only warn if this declarator is declaring a function at block scope, and 2301 // doesn't have a storage class (such as 'extern') specified. 2302 if (!D.isFunctionDeclarator() || 2303 D.getFunctionDefinitionKind() != FDK_Declaration || 2304 !S.CurContext->isFunctionOrMethod() || 2305 D.getDeclSpec().getStorageClassSpecAsWritten() 2306 != DeclSpec::SCS_unspecified) 2307 return; 2308 2309 // Inside a condition, a direct initializer is not permitted. We allow one to 2310 // be parsed in order to give better diagnostics in condition parsing. 2311 if (D.getContext() == Declarator::ConditionContext) 2312 return; 2313 2314 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2315 2316 S.Diag(DeclType.Loc, 2317 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2318 : diag::warn_empty_parens_are_function_decl) 2319 << ParenRange; 2320 2321 // If the declaration looks like: 2322 // T var1, 2323 // f(); 2324 // and name lookup finds a function named 'f', then the ',' was 2325 // probably intended to be a ';'. 2326 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2327 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2328 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2329 if (Comma.getFileID() != Name.getFileID() || 2330 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2331 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2332 Sema::LookupOrdinaryName); 2333 if (S.LookupName(Result, S.getCurScope())) 2334 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2335 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2336 << D.getIdentifier(); 2337 } 2338 } 2339 2340 if (FTI.NumArgs > 0) { 2341 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2342 // around the first parameter to turn the declaration into a variable 2343 // declaration. 2344 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2345 SourceLocation B = Range.getBegin(); 2346 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2347 // FIXME: Maybe we should suggest adding braces instead of parens 2348 // in C++11 for classes that don't have an initializer_list constructor. 2349 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2350 << FixItHint::CreateInsertion(B, "(") 2351 << FixItHint::CreateInsertion(E, ")"); 2352 } else { 2353 // For a declaration without parameters, eg. "T var();", suggest replacing the 2354 // parens with an initializer to turn the declaration into a variable 2355 // declaration. 2356 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2357 2358 // Empty parens mean value-initialization, and no parens mean 2359 // default initialization. These are equivalent if the default 2360 // constructor is user-provided or if zero-initialization is a 2361 // no-op. 2362 if (RD && RD->hasDefinition() && 2363 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2364 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2365 << FixItHint::CreateRemoval(ParenRange); 2366 else { 2367 std::string Init = S.getFixItZeroInitializerForType(RT); 2368 if (Init.empty() && S.LangOpts.CPlusPlus11) 2369 Init = "{}"; 2370 if (!Init.empty()) 2371 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2372 << FixItHint::CreateReplacement(ParenRange, Init); 2373 } 2374 } 2375} 2376 2377static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2378 QualType declSpecType, 2379 TypeSourceInfo *TInfo) { 2380 2381 QualType T = declSpecType; 2382 Declarator &D = state.getDeclarator(); 2383 Sema &S = state.getSema(); 2384 ASTContext &Context = S.Context; 2385 const LangOptions &LangOpts = S.getLangOpts(); 2386 2387 // The name we're declaring, if any. 2388 DeclarationName Name; 2389 if (D.getIdentifier()) 2390 Name = D.getIdentifier(); 2391 2392 // Does this declaration declare a typedef-name? 2393 bool IsTypedefName = 2394 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2395 D.getContext() == Declarator::AliasDeclContext || 2396 D.getContext() == Declarator::AliasTemplateContext; 2397 2398 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2399 bool IsQualifiedFunction = T->isFunctionProtoType() && 2400 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2401 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2402 2403 // Walk the DeclTypeInfo, building the recursive type as we go. 2404 // DeclTypeInfos are ordered from the identifier out, which is 2405 // opposite of what we want :). 2406 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2407 unsigned chunkIndex = e - i - 1; 2408 state.setCurrentChunkIndex(chunkIndex); 2409 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2410 if (IsQualifiedFunction) { 2411 checkQualifiedFunction(S, T, DeclType); 2412 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2413 } 2414 switch (DeclType.Kind) { 2415 case DeclaratorChunk::Paren: 2416 T = S.BuildParenType(T); 2417 break; 2418 case DeclaratorChunk::BlockPointer: 2419 // If blocks are disabled, emit an error. 2420 if (!LangOpts.Blocks) 2421 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2422 2423 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2424 if (DeclType.Cls.TypeQuals) 2425 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2426 break; 2427 case DeclaratorChunk::Pointer: 2428 // Verify that we're not building a pointer to pointer to function with 2429 // exception specification. 2430 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2431 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2432 D.setInvalidType(true); 2433 // Build the type anyway. 2434 } 2435 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2436 T = Context.getObjCObjectPointerType(T); 2437 if (DeclType.Ptr.TypeQuals) 2438 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2439 break; 2440 } 2441 T = S.BuildPointerType(T, DeclType.Loc, Name); 2442 if (DeclType.Ptr.TypeQuals) 2443 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2444 2445 break; 2446 case DeclaratorChunk::Reference: { 2447 // Verify that we're not building a reference to pointer to function with 2448 // exception specification. 2449 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2450 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2451 D.setInvalidType(true); 2452 // Build the type anyway. 2453 } 2454 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2455 2456 Qualifiers Quals; 2457 if (DeclType.Ref.HasRestrict) 2458 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2459 break; 2460 } 2461 case DeclaratorChunk::Array: { 2462 // Verify that we're not building an array of pointers to function with 2463 // exception specification. 2464 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2465 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2466 D.setInvalidType(true); 2467 // Build the type anyway. 2468 } 2469 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2470 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2471 ArrayType::ArraySizeModifier ASM; 2472 if (ATI.isStar) 2473 ASM = ArrayType::Star; 2474 else if (ATI.hasStatic) 2475 ASM = ArrayType::Static; 2476 else 2477 ASM = ArrayType::Normal; 2478 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2479 // FIXME: This check isn't quite right: it allows star in prototypes 2480 // for function definitions, and disallows some edge cases detailed 2481 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2482 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2483 ASM = ArrayType::Normal; 2484 D.setInvalidType(true); 2485 } 2486 2487 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2488 // shall appear only in a declaration of a function parameter with an 2489 // array type, ... 2490 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2491 if (!(D.isPrototypeContext() || 2492 D.getContext() == Declarator::KNRTypeListContext)) { 2493 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2494 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2495 // Remove the 'static' and the type qualifiers. 2496 if (ASM == ArrayType::Static) 2497 ASM = ArrayType::Normal; 2498 ATI.TypeQuals = 0; 2499 D.setInvalidType(true); 2500 } 2501 2502 // C99 6.7.5.2p1: ... and then only in the outermost array type 2503 // derivation. 2504 unsigned x = chunkIndex; 2505 while (x != 0) { 2506 // Walk outwards along the declarator chunks. 2507 x--; 2508 const DeclaratorChunk &DC = D.getTypeObject(x); 2509 switch (DC.Kind) { 2510 case DeclaratorChunk::Paren: 2511 continue; 2512 case DeclaratorChunk::Array: 2513 case DeclaratorChunk::Pointer: 2514 case DeclaratorChunk::Reference: 2515 case DeclaratorChunk::MemberPointer: 2516 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2517 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2518 if (ASM == ArrayType::Static) 2519 ASM = ArrayType::Normal; 2520 ATI.TypeQuals = 0; 2521 D.setInvalidType(true); 2522 break; 2523 case DeclaratorChunk::Function: 2524 case DeclaratorChunk::BlockPointer: 2525 // These are invalid anyway, so just ignore. 2526 break; 2527 } 2528 } 2529 } 2530 2531 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2532 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2533 break; 2534 } 2535 case DeclaratorChunk::Function: { 2536 // If the function declarator has a prototype (i.e. it is not () and 2537 // does not have a K&R-style identifier list), then the arguments are part 2538 // of the type, otherwise the argument list is (). 2539 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2540 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2541 2542 // Check for auto functions and trailing return type and adjust the 2543 // return type accordingly. 2544 if (!D.isInvalidType()) { 2545 // trailing-return-type is only required if we're declaring a function, 2546 // and not, for instance, a pointer to a function. 2547 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2548 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2549 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2550 diag::err_auto_missing_trailing_return); 2551 T = Context.IntTy; 2552 D.setInvalidType(true); 2553 } else if (FTI.hasTrailingReturnType()) { 2554 // T must be exactly 'auto' at this point. See CWG issue 681. 2555 if (isa<ParenType>(T)) { 2556 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2557 diag::err_trailing_return_in_parens) 2558 << T << D.getDeclSpec().getSourceRange(); 2559 D.setInvalidType(true); 2560 } else if (D.getContext() != Declarator::LambdaExprContext && 2561 (T.hasQualifiers() || !isa<AutoType>(T))) { 2562 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2563 diag::err_trailing_return_without_auto) 2564 << T << D.getDeclSpec().getSourceRange(); 2565 D.setInvalidType(true); 2566 } 2567 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2568 if (T.isNull()) { 2569 // An error occurred parsing the trailing return type. 2570 T = Context.IntTy; 2571 D.setInvalidType(true); 2572 } 2573 } 2574 } 2575 2576 // C99 6.7.5.3p1: The return type may not be a function or array type. 2577 // For conversion functions, we'll diagnose this particular error later. 2578 if ((T->isArrayType() || T->isFunctionType()) && 2579 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2580 unsigned diagID = diag::err_func_returning_array_function; 2581 // Last processing chunk in block context means this function chunk 2582 // represents the block. 2583 if (chunkIndex == 0 && 2584 D.getContext() == Declarator::BlockLiteralContext) 2585 diagID = diag::err_block_returning_array_function; 2586 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2587 T = Context.IntTy; 2588 D.setInvalidType(true); 2589 } 2590 2591 // Do not allow returning half FP value. 2592 // FIXME: This really should be in BuildFunctionType. 2593 if (T->isHalfType()) { 2594 if (S.getLangOpts().OpenCL) { 2595 if (!S.getOpenCLOptions().cl_khr_fp16) { 2596 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; 2597 D.setInvalidType(true); 2598 } 2599 } else { 2600 S.Diag(D.getIdentifierLoc(), 2601 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 2602 D.setInvalidType(true); 2603 } 2604 } 2605 2606 // cv-qualifiers on return types are pointless except when the type is a 2607 // class type in C++. 2608 if ((T.getCVRQualifiers() || T->isAtomicType()) && 2609 !(S.getLangOpts().CPlusPlus && 2610 (T->isDependentType() || T->isRecordType()))) 2611 diagnoseIgnoredFunctionQualifiers(S, T, D, chunkIndex); 2612 2613 // Objective-C ARC ownership qualifiers are ignored on the function 2614 // return type (by type canonicalization). Complain if this attribute 2615 // was written here. 2616 if (T.getQualifiers().hasObjCLifetime()) { 2617 SourceLocation AttrLoc; 2618 if (chunkIndex + 1 < D.getNumTypeObjects()) { 2619 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2620 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); 2621 Attr; Attr = Attr->getNext()) { 2622 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2623 AttrLoc = Attr->getLoc(); 2624 break; 2625 } 2626 } 2627 } 2628 if (AttrLoc.isInvalid()) { 2629 for (const AttributeList *Attr 2630 = D.getDeclSpec().getAttributes().getList(); 2631 Attr; Attr = Attr->getNext()) { 2632 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2633 AttrLoc = Attr->getLoc(); 2634 break; 2635 } 2636 } 2637 } 2638 2639 if (AttrLoc.isValid()) { 2640 // The ownership attributes are almost always written via 2641 // the predefined 2642 // __strong/__weak/__autoreleasing/__unsafe_unretained. 2643 if (AttrLoc.isMacroID()) 2644 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; 2645 2646 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 2647 << T.getQualifiers().getObjCLifetime(); 2648 } 2649 } 2650 2651 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2652 // C++ [dcl.fct]p6: 2653 // Types shall not be defined in return or parameter types. 2654 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2655 if (Tag->isCompleteDefinition()) 2656 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2657 << Context.getTypeDeclType(Tag); 2658 } 2659 2660 // Exception specs are not allowed in typedefs. Complain, but add it 2661 // anyway. 2662 if (IsTypedefName && FTI.getExceptionSpecType()) 2663 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2664 << (D.getContext() == Declarator::AliasDeclContext || 2665 D.getContext() == Declarator::AliasTemplateContext); 2666 2667 // If we see "T var();" or "T var(T());" at block scope, it is probably 2668 // an attempt to initialize a variable, not a function declaration. 2669 if (FTI.isAmbiguous) 2670 warnAboutAmbiguousFunction(S, D, DeclType, T); 2671 2672 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2673 // Simple void foo(), where the incoming T is the result type. 2674 T = Context.getFunctionNoProtoType(T); 2675 } else { 2676 // We allow a zero-parameter variadic function in C if the 2677 // function is marked with the "overloadable" attribute. Scan 2678 // for this attribute now. 2679 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2680 bool Overloadable = false; 2681 for (const AttributeList *Attrs = D.getAttributes(); 2682 Attrs; Attrs = Attrs->getNext()) { 2683 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2684 Overloadable = true; 2685 break; 2686 } 2687 } 2688 2689 if (!Overloadable) 2690 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2691 } 2692 2693 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2694 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2695 // definition. 2696 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2697 D.setInvalidType(true); 2698 // Recover by creating a K&R-style function type. 2699 T = Context.getFunctionNoProtoType(T); 2700 break; 2701 } 2702 2703 FunctionProtoType::ExtProtoInfo EPI; 2704 EPI.Variadic = FTI.isVariadic; 2705 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2706 EPI.TypeQuals = FTI.TypeQuals; 2707 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2708 : FTI.RefQualifierIsLValueRef? RQ_LValue 2709 : RQ_RValue; 2710 2711 // Otherwise, we have a function with an argument list that is 2712 // potentially variadic. 2713 SmallVector<QualType, 16> ArgTys; 2714 ArgTys.reserve(FTI.NumArgs); 2715 2716 SmallVector<bool, 16> ConsumedArguments; 2717 ConsumedArguments.reserve(FTI.NumArgs); 2718 bool HasAnyConsumedArguments = false; 2719 2720 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2721 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2722 QualType ArgTy = Param->getType(); 2723 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2724 2725 // Adjust the parameter type. 2726 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2727 "Unadjusted type?"); 2728 2729 // Look for 'void'. void is allowed only as a single argument to a 2730 // function with no other parameters (C99 6.7.5.3p10). We record 2731 // int(void) as a FunctionProtoType with an empty argument list. 2732 if (ArgTy->isVoidType()) { 2733 // If this is something like 'float(int, void)', reject it. 'void' 2734 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2735 // have arguments of incomplete type. 2736 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2737 S.Diag(DeclType.Loc, diag::err_void_only_param); 2738 ArgTy = Context.IntTy; 2739 Param->setType(ArgTy); 2740 } else if (FTI.ArgInfo[i].Ident) { 2741 // Reject, but continue to parse 'int(void abc)'. 2742 S.Diag(FTI.ArgInfo[i].IdentLoc, 2743 diag::err_param_with_void_type); 2744 ArgTy = Context.IntTy; 2745 Param->setType(ArgTy); 2746 } else { 2747 // Reject, but continue to parse 'float(const void)'. 2748 if (ArgTy.hasQualifiers()) 2749 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2750 2751 // Do not add 'void' to the ArgTys list. 2752 break; 2753 } 2754 } else if (ArgTy->isHalfType()) { 2755 // Disallow half FP arguments. 2756 // FIXME: This really should be in BuildFunctionType. 2757 if (S.getLangOpts().OpenCL) { 2758 if (!S.getOpenCLOptions().cl_khr_fp16) { 2759 S.Diag(Param->getLocation(), 2760 diag::err_opencl_half_argument) << ArgTy; 2761 D.setInvalidType(); 2762 Param->setInvalidDecl(); 2763 } 2764 } else { 2765 S.Diag(Param->getLocation(), 2766 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 2767 D.setInvalidType(); 2768 } 2769 } else if (!FTI.hasPrototype) { 2770 if (ArgTy->isPromotableIntegerType()) { 2771 ArgTy = Context.getPromotedIntegerType(ArgTy); 2772 Param->setKNRPromoted(true); 2773 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2774 if (BTy->getKind() == BuiltinType::Float) { 2775 ArgTy = Context.DoubleTy; 2776 Param->setKNRPromoted(true); 2777 } 2778 } 2779 } 2780 2781 if (LangOpts.ObjCAutoRefCount) { 2782 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2783 ConsumedArguments.push_back(Consumed); 2784 HasAnyConsumedArguments |= Consumed; 2785 } 2786 2787 ArgTys.push_back(ArgTy); 2788 } 2789 2790 if (HasAnyConsumedArguments) 2791 EPI.ConsumedArguments = ConsumedArguments.data(); 2792 2793 SmallVector<QualType, 4> Exceptions; 2794 SmallVector<ParsedType, 2> DynamicExceptions; 2795 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2796 Expr *NoexceptExpr = 0; 2797 2798 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2799 // FIXME: It's rather inefficient to have to split into two vectors 2800 // here. 2801 unsigned N = FTI.NumExceptions; 2802 DynamicExceptions.reserve(N); 2803 DynamicExceptionRanges.reserve(N); 2804 for (unsigned I = 0; I != N; ++I) { 2805 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2806 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2807 } 2808 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2809 NoexceptExpr = FTI.NoexceptExpr; 2810 } 2811 2812 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2813 DynamicExceptions, 2814 DynamicExceptionRanges, 2815 NoexceptExpr, 2816 Exceptions, 2817 EPI); 2818 2819 T = Context.getFunctionType(T, ArgTys, EPI); 2820 } 2821 2822 break; 2823 } 2824 case DeclaratorChunk::MemberPointer: 2825 // The scope spec must refer to a class, or be dependent. 2826 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2827 QualType ClsType; 2828 if (SS.isInvalid()) { 2829 // Avoid emitting extra errors if we already errored on the scope. 2830 D.setInvalidType(true); 2831 } else if (S.isDependentScopeSpecifier(SS) || 2832 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2833 NestedNameSpecifier *NNS 2834 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2835 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2836 switch (NNS->getKind()) { 2837 case NestedNameSpecifier::Identifier: 2838 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2839 NNS->getAsIdentifier()); 2840 break; 2841 2842 case NestedNameSpecifier::Namespace: 2843 case NestedNameSpecifier::NamespaceAlias: 2844 case NestedNameSpecifier::Global: 2845 llvm_unreachable("Nested-name-specifier must name a type"); 2846 2847 case NestedNameSpecifier::TypeSpec: 2848 case NestedNameSpecifier::TypeSpecWithTemplate: 2849 ClsType = QualType(NNS->getAsType(), 0); 2850 // Note: if the NNS has a prefix and ClsType is a nondependent 2851 // TemplateSpecializationType, then the NNS prefix is NOT included 2852 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2853 // NOTE: in particular, no wrap occurs if ClsType already is an 2854 // Elaborated, DependentName, or DependentTemplateSpecialization. 2855 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2856 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2857 break; 2858 } 2859 } else { 2860 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2861 diag::err_illegal_decl_mempointer_in_nonclass) 2862 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2863 << DeclType.Mem.Scope().getRange(); 2864 D.setInvalidType(true); 2865 } 2866 2867 if (!ClsType.isNull()) 2868 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2869 if (T.isNull()) { 2870 T = Context.IntTy; 2871 D.setInvalidType(true); 2872 } else if (DeclType.Mem.TypeQuals) { 2873 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2874 } 2875 break; 2876 } 2877 2878 if (T.isNull()) { 2879 D.setInvalidType(true); 2880 T = Context.IntTy; 2881 } 2882 2883 // See if there are any attributes on this declarator chunk. 2884 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2885 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 2886 } 2887 2888 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2889 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2890 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2891 2892 // C++ 8.3.5p4: 2893 // A cv-qualifier-seq shall only be part of the function type 2894 // for a nonstatic member function, the function type to which a pointer 2895 // to member refers, or the top-level function type of a function typedef 2896 // declaration. 2897 // 2898 // Core issue 547 also allows cv-qualifiers on function types that are 2899 // top-level template type arguments. 2900 bool FreeFunction; 2901 if (!D.getCXXScopeSpec().isSet()) { 2902 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2903 D.getContext() != Declarator::LambdaExprContext) || 2904 D.getDeclSpec().isFriendSpecified()); 2905 } else { 2906 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2907 FreeFunction = (DC && !DC->isRecord()); 2908 } 2909 2910 // C++11 [dcl.fct]p6 (w/DR1417): 2911 // An attempt to specify a function type with a cv-qualifier-seq or a 2912 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2913 // - the function type for a non-static member function, 2914 // - the function type to which a pointer to member refers, 2915 // - the top-level function type of a function typedef declaration or 2916 // alias-declaration, 2917 // - the type-id in the default argument of a type-parameter, or 2918 // - the type-id of a template-argument for a type-parameter 2919 if (IsQualifiedFunction && 2920 !(!FreeFunction && 2921 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2922 !IsTypedefName && 2923 D.getContext() != Declarator::TemplateTypeArgContext) { 2924 SourceLocation Loc = D.getLocStart(); 2925 SourceRange RemovalRange; 2926 unsigned I; 2927 if (D.isFunctionDeclarator(I)) { 2928 SmallVector<SourceLocation, 4> RemovalLocs; 2929 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2930 assert(Chunk.Kind == DeclaratorChunk::Function); 2931 if (Chunk.Fun.hasRefQualifier()) 2932 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2933 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2934 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2935 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2936 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2937 // FIXME: We do not track the location of the __restrict qualifier. 2938 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2939 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2940 if (!RemovalLocs.empty()) { 2941 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2942 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2943 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2944 Loc = RemovalLocs.front(); 2945 } 2946 } 2947 2948 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2949 << FreeFunction << D.isFunctionDeclarator() << T 2950 << getFunctionQualifiersAsString(FnTy) 2951 << FixItHint::CreateRemoval(RemovalRange); 2952 2953 // Strip the cv-qualifiers and ref-qualifiers from the type. 2954 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2955 EPI.TypeQuals = 0; 2956 EPI.RefQualifier = RQ_None; 2957 2958 T = Context.getFunctionType(FnTy->getResultType(), 2959 ArrayRef<QualType>(FnTy->arg_type_begin(), 2960 FnTy->getNumArgs()), 2961 EPI); 2962 // Rebuild any parens around the identifier in the function type. 2963 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2964 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2965 break; 2966 T = S.BuildParenType(T); 2967 } 2968 } 2969 } 2970 2971 // Apply any undistributed attributes from the declarator. 2972 if (!T.isNull()) 2973 if (AttributeList *attrs = D.getAttributes()) 2974 processTypeAttrs(state, T, TAL_DeclName, attrs); 2975 2976 // Diagnose any ignored type attributes. 2977 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2978 2979 // C++0x [dcl.constexpr]p9: 2980 // A constexpr specifier used in an object declaration declares the object 2981 // as const. 2982 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2983 T.addConst(); 2984 } 2985 2986 // If there was an ellipsis in the declarator, the declaration declares a 2987 // parameter pack whose type may be a pack expansion type. 2988 if (D.hasEllipsis() && !T.isNull()) { 2989 // C++0x [dcl.fct]p13: 2990 // A declarator-id or abstract-declarator containing an ellipsis shall 2991 // only be used in a parameter-declaration. Such a parameter-declaration 2992 // is a parameter pack (14.5.3). [...] 2993 switch (D.getContext()) { 2994 case Declarator::PrototypeContext: 2995 // C++0x [dcl.fct]p13: 2996 // [...] When it is part of a parameter-declaration-clause, the 2997 // parameter pack is a function parameter pack (14.5.3). The type T 2998 // of the declarator-id of the function parameter pack shall contain 2999 // a template parameter pack; each template parameter pack in T is 3000 // expanded by the function parameter pack. 3001 // 3002 // We represent function parameter packs as function parameters whose 3003 // type is a pack expansion. 3004 if (!T->containsUnexpandedParameterPack()) { 3005 S.Diag(D.getEllipsisLoc(), 3006 diag::err_function_parameter_pack_without_parameter_packs) 3007 << T << D.getSourceRange(); 3008 D.setEllipsisLoc(SourceLocation()); 3009 } else { 3010 T = Context.getPackExpansionType(T, None); 3011 } 3012 break; 3013 3014 case Declarator::TemplateParamContext: 3015 // C++0x [temp.param]p15: 3016 // If a template-parameter is a [...] is a parameter-declaration that 3017 // declares a parameter pack (8.3.5), then the template-parameter is a 3018 // template parameter pack (14.5.3). 3019 // 3020 // Note: core issue 778 clarifies that, if there are any unexpanded 3021 // parameter packs in the type of the non-type template parameter, then 3022 // it expands those parameter packs. 3023 if (T->containsUnexpandedParameterPack()) 3024 T = Context.getPackExpansionType(T, None); 3025 else 3026 S.Diag(D.getEllipsisLoc(), 3027 LangOpts.CPlusPlus11 3028 ? diag::warn_cxx98_compat_variadic_templates 3029 : diag::ext_variadic_templates); 3030 break; 3031 3032 case Declarator::FileContext: 3033 case Declarator::KNRTypeListContext: 3034 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 3035 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 3036 case Declarator::TypeNameContext: 3037 case Declarator::CXXNewContext: 3038 case Declarator::AliasDeclContext: 3039 case Declarator::AliasTemplateContext: 3040 case Declarator::MemberContext: 3041 case Declarator::BlockContext: 3042 case Declarator::ForContext: 3043 case Declarator::ConditionContext: 3044 case Declarator::CXXCatchContext: 3045 case Declarator::ObjCCatchContext: 3046 case Declarator::BlockLiteralContext: 3047 case Declarator::LambdaExprContext: 3048 case Declarator::TrailingReturnContext: 3049 case Declarator::TemplateTypeArgContext: 3050 // FIXME: We may want to allow parameter packs in block-literal contexts 3051 // in the future. 3052 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 3053 D.setEllipsisLoc(SourceLocation()); 3054 break; 3055 } 3056 } 3057 3058 if (T.isNull()) 3059 return Context.getNullTypeSourceInfo(); 3060 else if (D.isInvalidType()) 3061 return Context.getTrivialTypeSourceInfo(T); 3062 3063 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 3064} 3065 3066/// GetTypeForDeclarator - Convert the type for the specified 3067/// declarator to Type instances. 3068/// 3069/// The result of this call will never be null, but the associated 3070/// type may be a null type if there's an unrecoverable error. 3071TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 3072 // Determine the type of the declarator. Not all forms of declarator 3073 // have a type. 3074 3075 TypeProcessingState state(*this, D); 3076 3077 TypeSourceInfo *ReturnTypeInfo = 0; 3078 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3079 if (T.isNull()) 3080 return Context.getNullTypeSourceInfo(); 3081 3082 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 3083 inferARCWriteback(state, T); 3084 3085 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 3086} 3087 3088static void transferARCOwnershipToDeclSpec(Sema &S, 3089 QualType &declSpecTy, 3090 Qualifiers::ObjCLifetime ownership) { 3091 if (declSpecTy->isObjCRetainableType() && 3092 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 3093 Qualifiers qs; 3094 qs.addObjCLifetime(ownership); 3095 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 3096 } 3097} 3098 3099static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 3100 Qualifiers::ObjCLifetime ownership, 3101 unsigned chunkIndex) { 3102 Sema &S = state.getSema(); 3103 Declarator &D = state.getDeclarator(); 3104 3105 // Look for an explicit lifetime attribute. 3106 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 3107 for (const AttributeList *attr = chunk.getAttrs(); attr; 3108 attr = attr->getNext()) 3109 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 3110 return; 3111 3112 const char *attrStr = 0; 3113 switch (ownership) { 3114 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 3115 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 3116 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 3117 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 3118 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 3119 } 3120 3121 // If there wasn't one, add one (with an invalid source location 3122 // so that we don't make an AttributedType for it). 3123 AttributeList *attr = D.getAttributePool() 3124 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 3125 /*scope*/ 0, SourceLocation(), 3126 &S.Context.Idents.get(attrStr), SourceLocation(), 3127 /*args*/ 0, 0, AttributeList::AS_GNU); 3128 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 3129 3130 // TODO: mark whether we did this inference? 3131} 3132 3133/// \brief Used for transferring ownership in casts resulting in l-values. 3134static void transferARCOwnership(TypeProcessingState &state, 3135 QualType &declSpecTy, 3136 Qualifiers::ObjCLifetime ownership) { 3137 Sema &S = state.getSema(); 3138 Declarator &D = state.getDeclarator(); 3139 3140 int inner = -1; 3141 bool hasIndirection = false; 3142 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3143 DeclaratorChunk &chunk = D.getTypeObject(i); 3144 switch (chunk.Kind) { 3145 case DeclaratorChunk::Paren: 3146 // Ignore parens. 3147 break; 3148 3149 case DeclaratorChunk::Array: 3150 case DeclaratorChunk::Reference: 3151 case DeclaratorChunk::Pointer: 3152 if (inner != -1) 3153 hasIndirection = true; 3154 inner = i; 3155 break; 3156 3157 case DeclaratorChunk::BlockPointer: 3158 if (inner != -1) 3159 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 3160 return; 3161 3162 case DeclaratorChunk::Function: 3163 case DeclaratorChunk::MemberPointer: 3164 return; 3165 } 3166 } 3167 3168 if (inner == -1) 3169 return; 3170 3171 DeclaratorChunk &chunk = D.getTypeObject(inner); 3172 if (chunk.Kind == DeclaratorChunk::Pointer) { 3173 if (declSpecTy->isObjCRetainableType()) 3174 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3175 if (declSpecTy->isObjCObjectType() && hasIndirection) 3176 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 3177 } else { 3178 assert(chunk.Kind == DeclaratorChunk::Array || 3179 chunk.Kind == DeclaratorChunk::Reference); 3180 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3181 } 3182} 3183 3184TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 3185 TypeProcessingState state(*this, D); 3186 3187 TypeSourceInfo *ReturnTypeInfo = 0; 3188 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3189 if (declSpecTy.isNull()) 3190 return Context.getNullTypeSourceInfo(); 3191 3192 if (getLangOpts().ObjCAutoRefCount) { 3193 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3194 if (ownership != Qualifiers::OCL_None) 3195 transferARCOwnership(state, declSpecTy, ownership); 3196 } 3197 3198 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3199} 3200 3201/// Map an AttributedType::Kind to an AttributeList::Kind. 3202static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3203 switch (kind) { 3204 case AttributedType::attr_address_space: 3205 return AttributeList::AT_AddressSpace; 3206 case AttributedType::attr_regparm: 3207 return AttributeList::AT_Regparm; 3208 case AttributedType::attr_vector_size: 3209 return AttributeList::AT_VectorSize; 3210 case AttributedType::attr_neon_vector_type: 3211 return AttributeList::AT_NeonVectorType; 3212 case AttributedType::attr_neon_polyvector_type: 3213 return AttributeList::AT_NeonPolyVectorType; 3214 case AttributedType::attr_objc_gc: 3215 return AttributeList::AT_ObjCGC; 3216 case AttributedType::attr_objc_ownership: 3217 return AttributeList::AT_ObjCOwnership; 3218 case AttributedType::attr_noreturn: 3219 return AttributeList::AT_NoReturn; 3220 case AttributedType::attr_cdecl: 3221 return AttributeList::AT_CDecl; 3222 case AttributedType::attr_fastcall: 3223 return AttributeList::AT_FastCall; 3224 case AttributedType::attr_stdcall: 3225 return AttributeList::AT_StdCall; 3226 case AttributedType::attr_thiscall: 3227 return AttributeList::AT_ThisCall; 3228 case AttributedType::attr_pascal: 3229 return AttributeList::AT_Pascal; 3230 case AttributedType::attr_pcs: 3231 return AttributeList::AT_Pcs; 3232 case AttributedType::attr_pnaclcall: 3233 return AttributeList::AT_PnaclCall; 3234 case AttributedType::attr_inteloclbicc: 3235 return AttributeList::AT_IntelOclBicc; 3236 } 3237 llvm_unreachable("unexpected attribute kind!"); 3238} 3239 3240static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3241 const AttributeList *attrs) { 3242 AttributedType::Kind kind = TL.getAttrKind(); 3243 3244 assert(attrs && "no type attributes in the expected location!"); 3245 AttributeList::Kind parsedKind = getAttrListKind(kind); 3246 while (attrs->getKind() != parsedKind) { 3247 attrs = attrs->getNext(); 3248 assert(attrs && "no matching attribute in expected location!"); 3249 } 3250 3251 TL.setAttrNameLoc(attrs->getLoc()); 3252 if (TL.hasAttrExprOperand()) 3253 TL.setAttrExprOperand(attrs->getArg(0)); 3254 else if (TL.hasAttrEnumOperand()) 3255 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3256 3257 // FIXME: preserve this information to here. 3258 if (TL.hasAttrOperand()) 3259 TL.setAttrOperandParensRange(SourceRange()); 3260} 3261 3262namespace { 3263 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3264 ASTContext &Context; 3265 const DeclSpec &DS; 3266 3267 public: 3268 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3269 : Context(Context), DS(DS) {} 3270 3271 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3272 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3273 Visit(TL.getModifiedLoc()); 3274 } 3275 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3276 Visit(TL.getUnqualifiedLoc()); 3277 } 3278 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3279 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3280 } 3281 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3282 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3283 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3284 // addition field. What we have is good enough for dispay of location 3285 // of 'fixit' on interface name. 3286 TL.setNameEndLoc(DS.getLocEnd()); 3287 } 3288 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3289 // Handle the base type, which might not have been written explicitly. 3290 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3291 TL.setHasBaseTypeAsWritten(false); 3292 TL.getBaseLoc().initialize(Context, SourceLocation()); 3293 } else { 3294 TL.setHasBaseTypeAsWritten(true); 3295 Visit(TL.getBaseLoc()); 3296 } 3297 3298 // Protocol qualifiers. 3299 if (DS.getProtocolQualifiers()) { 3300 assert(TL.getNumProtocols() > 0); 3301 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3302 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3303 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3304 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3305 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3306 } else { 3307 assert(TL.getNumProtocols() == 0); 3308 TL.setLAngleLoc(SourceLocation()); 3309 TL.setRAngleLoc(SourceLocation()); 3310 } 3311 } 3312 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3313 TL.setStarLoc(SourceLocation()); 3314 Visit(TL.getPointeeLoc()); 3315 } 3316 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3317 TypeSourceInfo *TInfo = 0; 3318 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3319 3320 // If we got no declarator info from previous Sema routines, 3321 // just fill with the typespec loc. 3322 if (!TInfo) { 3323 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3324 return; 3325 } 3326 3327 TypeLoc OldTL = TInfo->getTypeLoc(); 3328 if (TInfo->getType()->getAs<ElaboratedType>()) { 3329 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 3330 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 3331 .castAs<TemplateSpecializationTypeLoc>(); 3332 TL.copy(NamedTL); 3333 } 3334 else 3335 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 3336 } 3337 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3338 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3339 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3340 TL.setParensRange(DS.getTypeofParensRange()); 3341 } 3342 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3343 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3344 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3345 TL.setParensRange(DS.getTypeofParensRange()); 3346 assert(DS.getRepAsType()); 3347 TypeSourceInfo *TInfo = 0; 3348 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3349 TL.setUnderlyingTInfo(TInfo); 3350 } 3351 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3352 // FIXME: This holds only because we only have one unary transform. 3353 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3354 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3355 TL.setParensRange(DS.getTypeofParensRange()); 3356 assert(DS.getRepAsType()); 3357 TypeSourceInfo *TInfo = 0; 3358 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3359 TL.setUnderlyingTInfo(TInfo); 3360 } 3361 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3362 // By default, use the source location of the type specifier. 3363 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3364 if (TL.needsExtraLocalData()) { 3365 // Set info for the written builtin specifiers. 3366 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3367 // Try to have a meaningful source location. 3368 if (TL.getWrittenSignSpec() != TSS_unspecified) 3369 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3370 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3371 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3372 // Width spec loc overrides type spec loc (e.g., 'short int'). 3373 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3374 } 3375 } 3376 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3377 ElaboratedTypeKeyword Keyword 3378 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3379 if (DS.getTypeSpecType() == TST_typename) { 3380 TypeSourceInfo *TInfo = 0; 3381 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3382 if (TInfo) { 3383 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 3384 return; 3385 } 3386 } 3387 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3388 ? DS.getTypeSpecTypeLoc() 3389 : SourceLocation()); 3390 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3391 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3392 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3393 } 3394 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3395 assert(DS.getTypeSpecType() == TST_typename); 3396 TypeSourceInfo *TInfo = 0; 3397 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3398 assert(TInfo); 3399 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 3400 } 3401 void VisitDependentTemplateSpecializationTypeLoc( 3402 DependentTemplateSpecializationTypeLoc TL) { 3403 assert(DS.getTypeSpecType() == TST_typename); 3404 TypeSourceInfo *TInfo = 0; 3405 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3406 assert(TInfo); 3407 TL.copy( 3408 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 3409 } 3410 void VisitTagTypeLoc(TagTypeLoc TL) { 3411 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3412 } 3413 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3414 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier 3415 // or an _Atomic qualifier. 3416 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) { 3417 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3418 TL.setParensRange(DS.getTypeofParensRange()); 3419 3420 TypeSourceInfo *TInfo = 0; 3421 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3422 assert(TInfo); 3423 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3424 } else { 3425 TL.setKWLoc(DS.getAtomicSpecLoc()); 3426 // No parens, to indicate this was spelled as an _Atomic qualifier. 3427 TL.setParensRange(SourceRange()); 3428 Visit(TL.getValueLoc()); 3429 } 3430 } 3431 3432 void VisitTypeLoc(TypeLoc TL) { 3433 // FIXME: add other typespec types and change this to an assert. 3434 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3435 } 3436 }; 3437 3438 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3439 ASTContext &Context; 3440 const DeclaratorChunk &Chunk; 3441 3442 public: 3443 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3444 : Context(Context), Chunk(Chunk) {} 3445 3446 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3447 llvm_unreachable("qualified type locs not expected here!"); 3448 } 3449 3450 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3451 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3452 } 3453 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3454 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3455 TL.setCaretLoc(Chunk.Loc); 3456 } 3457 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3458 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3459 TL.setStarLoc(Chunk.Loc); 3460 } 3461 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3462 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3463 TL.setStarLoc(Chunk.Loc); 3464 } 3465 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3466 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3467 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3468 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3469 3470 const Type* ClsTy = TL.getClass(); 3471 QualType ClsQT = QualType(ClsTy, 0); 3472 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3473 // Now copy source location info into the type loc component. 3474 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3475 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3476 case NestedNameSpecifier::Identifier: 3477 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3478 { 3479 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 3480 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3481 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3482 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3483 } 3484 break; 3485 3486 case NestedNameSpecifier::TypeSpec: 3487 case NestedNameSpecifier::TypeSpecWithTemplate: 3488 if (isa<ElaboratedType>(ClsTy)) { 3489 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 3490 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3491 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3492 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3493 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3494 } else { 3495 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3496 } 3497 break; 3498 3499 case NestedNameSpecifier::Namespace: 3500 case NestedNameSpecifier::NamespaceAlias: 3501 case NestedNameSpecifier::Global: 3502 llvm_unreachable("Nested-name-specifier must name a type"); 3503 } 3504 3505 // Finally fill in MemberPointerLocInfo fields. 3506 TL.setStarLoc(Chunk.Loc); 3507 TL.setClassTInfo(ClsTInfo); 3508 } 3509 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3510 assert(Chunk.Kind == DeclaratorChunk::Reference); 3511 // 'Amp' is misleading: this might have been originally 3512 /// spelled with AmpAmp. 3513 TL.setAmpLoc(Chunk.Loc); 3514 } 3515 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3516 assert(Chunk.Kind == DeclaratorChunk::Reference); 3517 assert(!Chunk.Ref.LValueRef); 3518 TL.setAmpAmpLoc(Chunk.Loc); 3519 } 3520 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3521 assert(Chunk.Kind == DeclaratorChunk::Array); 3522 TL.setLBracketLoc(Chunk.Loc); 3523 TL.setRBracketLoc(Chunk.EndLoc); 3524 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3525 } 3526 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3527 assert(Chunk.Kind == DeclaratorChunk::Function); 3528 TL.setLocalRangeBegin(Chunk.Loc); 3529 TL.setLocalRangeEnd(Chunk.EndLoc); 3530 3531 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3532 TL.setLParenLoc(FTI.getLParenLoc()); 3533 TL.setRParenLoc(FTI.getRParenLoc()); 3534 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3535 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3536 TL.setArg(tpi++, Param); 3537 } 3538 // FIXME: exception specs 3539 } 3540 void VisitParenTypeLoc(ParenTypeLoc TL) { 3541 assert(Chunk.Kind == DeclaratorChunk::Paren); 3542 TL.setLParenLoc(Chunk.Loc); 3543 TL.setRParenLoc(Chunk.EndLoc); 3544 } 3545 3546 void VisitTypeLoc(TypeLoc TL) { 3547 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3548 } 3549 }; 3550} 3551 3552static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { 3553 SourceLocation Loc; 3554 switch (Chunk.Kind) { 3555 case DeclaratorChunk::Function: 3556 case DeclaratorChunk::Array: 3557 case DeclaratorChunk::Paren: 3558 llvm_unreachable("cannot be _Atomic qualified"); 3559 3560 case DeclaratorChunk::Pointer: 3561 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc); 3562 break; 3563 3564 case DeclaratorChunk::BlockPointer: 3565 case DeclaratorChunk::Reference: 3566 case DeclaratorChunk::MemberPointer: 3567 // FIXME: Provide a source location for the _Atomic keyword. 3568 break; 3569 } 3570 3571 ATL.setKWLoc(Loc); 3572 ATL.setParensRange(SourceRange()); 3573} 3574 3575/// \brief Create and instantiate a TypeSourceInfo with type source information. 3576/// 3577/// \param T QualType referring to the type as written in source code. 3578/// 3579/// \param ReturnTypeInfo For declarators whose return type does not show 3580/// up in the normal place in the declaration specifiers (such as a C++ 3581/// conversion function), this pointer will refer to a type source information 3582/// for that return type. 3583TypeSourceInfo * 3584Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3585 TypeSourceInfo *ReturnTypeInfo) { 3586 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3587 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3588 3589 // Handle parameter packs whose type is a pack expansion. 3590 if (isa<PackExpansionType>(T)) { 3591 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 3592 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3593 } 3594 3595 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3596 // An AtomicTypeLoc might be produced by an atomic qualifier in this 3597 // declarator chunk. 3598 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) { 3599 fillAtomicQualLoc(ATL, D.getTypeObject(i)); 3600 CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); 3601 } 3602 3603 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 3604 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3605 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3606 } 3607 3608 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3609 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3610 } 3611 3612 // If we have different source information for the return type, use 3613 // that. This really only applies to C++ conversion functions. 3614 if (ReturnTypeInfo) { 3615 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3616 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3617 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3618 } else { 3619 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3620 } 3621 3622 return TInfo; 3623} 3624 3625/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3626ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3627 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3628 // and Sema during declaration parsing. Try deallocating/caching them when 3629 // it's appropriate, instead of allocating them and keeping them around. 3630 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3631 TypeAlignment); 3632 new (LocT) LocInfoType(T, TInfo); 3633 assert(LocT->getTypeClass() != T->getTypeClass() && 3634 "LocInfoType's TypeClass conflicts with an existing Type class"); 3635 return ParsedType::make(QualType(LocT, 0)); 3636} 3637 3638void LocInfoType::getAsStringInternal(std::string &Str, 3639 const PrintingPolicy &Policy) const { 3640 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3641 " was used directly instead of getting the QualType through" 3642 " GetTypeFromParser"); 3643} 3644 3645TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3646 // C99 6.7.6: Type names have no identifier. This is already validated by 3647 // the parser. 3648 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3649 3650 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3651 QualType T = TInfo->getType(); 3652 if (D.isInvalidType()) 3653 return true; 3654 3655 // Make sure there are no unused decl attributes on the declarator. 3656 // We don't want to do this for ObjC parameters because we're going 3657 // to apply them to the actual parameter declaration. 3658 // Likewise, we don't want to do this for alias declarations, because 3659 // we are actually going to build a declaration from this eventually. 3660 if (D.getContext() != Declarator::ObjCParameterContext && 3661 D.getContext() != Declarator::AliasDeclContext && 3662 D.getContext() != Declarator::AliasTemplateContext) 3663 checkUnusedDeclAttributes(D); 3664 3665 if (getLangOpts().CPlusPlus) { 3666 // Check that there are no default arguments (C++ only). 3667 CheckExtraCXXDefaultArguments(D); 3668 } 3669 3670 return CreateParsedType(T, TInfo); 3671} 3672 3673ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3674 QualType T = Context.getObjCInstanceType(); 3675 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3676 return CreateParsedType(T, TInfo); 3677} 3678 3679 3680//===----------------------------------------------------------------------===// 3681// Type Attribute Processing 3682//===----------------------------------------------------------------------===// 3683 3684/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3685/// specified type. The attribute contains 1 argument, the id of the address 3686/// space for the type. 3687static void HandleAddressSpaceTypeAttribute(QualType &Type, 3688 const AttributeList &Attr, Sema &S){ 3689 3690 // If this type is already address space qualified, reject it. 3691 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3692 // qualifiers for two or more different address spaces." 3693 if (Type.getAddressSpace()) { 3694 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3695 Attr.setInvalid(); 3696 return; 3697 } 3698 3699 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3700 // qualified by an address-space qualifier." 3701 if (Type->isFunctionType()) { 3702 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3703 Attr.setInvalid(); 3704 return; 3705 } 3706 3707 // Check the attribute arguments. 3708 if (Attr.getNumArgs() != 1) { 3709 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3710 Attr.setInvalid(); 3711 return; 3712 } 3713 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3714 llvm::APSInt addrSpace(32); 3715 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3716 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3717 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3718 << ASArgExpr->getSourceRange(); 3719 Attr.setInvalid(); 3720 return; 3721 } 3722 3723 // Bounds checking. 3724 if (addrSpace.isSigned()) { 3725 if (addrSpace.isNegative()) { 3726 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3727 << ASArgExpr->getSourceRange(); 3728 Attr.setInvalid(); 3729 return; 3730 } 3731 addrSpace.setIsSigned(false); 3732 } 3733 llvm::APSInt max(addrSpace.getBitWidth()); 3734 max = Qualifiers::MaxAddressSpace; 3735 if (addrSpace > max) { 3736 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3737 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3738 Attr.setInvalid(); 3739 return; 3740 } 3741 3742 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3743 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3744} 3745 3746/// Does this type have a "direct" ownership qualifier? That is, 3747/// is it written like "__strong id", as opposed to something like 3748/// "typeof(foo)", where that happens to be strong? 3749static bool hasDirectOwnershipQualifier(QualType type) { 3750 // Fast path: no qualifier at all. 3751 assert(type.getQualifiers().hasObjCLifetime()); 3752 3753 while (true) { 3754 // __strong id 3755 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3756 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3757 return true; 3758 3759 type = attr->getModifiedType(); 3760 3761 // X *__strong (...) 3762 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3763 type = paren->getInnerType(); 3764 3765 // That's it for things we want to complain about. In particular, 3766 // we do not want to look through typedefs, typeof(expr), 3767 // typeof(type), or any other way that the type is somehow 3768 // abstracted. 3769 } else { 3770 3771 return false; 3772 } 3773 } 3774} 3775 3776/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3777/// attribute on the specified type. 3778/// 3779/// Returns 'true' if the attribute was handled. 3780static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3781 AttributeList &attr, 3782 QualType &type) { 3783 bool NonObjCPointer = false; 3784 3785 if (!type->isDependentType()) { 3786 if (const PointerType *ptr = type->getAs<PointerType>()) { 3787 QualType pointee = ptr->getPointeeType(); 3788 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3789 return false; 3790 // It is important not to lose the source info that there was an attribute 3791 // applied to non-objc pointer. We will create an attributed type but 3792 // its type will be the same as the original type. 3793 NonObjCPointer = true; 3794 } else if (!type->isObjCRetainableType()) { 3795 return false; 3796 } 3797 3798 // Don't accept an ownership attribute in the declspec if it would 3799 // just be the return type of a block pointer. 3800 if (state.isProcessingDeclSpec()) { 3801 Declarator &D = state.getDeclarator(); 3802 if (maybeMovePastReturnType(D, D.getNumTypeObjects())) 3803 return false; 3804 } 3805 } 3806 3807 Sema &S = state.getSema(); 3808 SourceLocation AttrLoc = attr.getLoc(); 3809 if (AttrLoc.isMacroID()) 3810 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3811 3812 if (!attr.getParameterName()) { 3813 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3814 << "objc_ownership" << 1; 3815 attr.setInvalid(); 3816 return true; 3817 } 3818 3819 // Consume lifetime attributes without further comment outside of 3820 // ARC mode. 3821 if (!S.getLangOpts().ObjCAutoRefCount) 3822 return true; 3823 3824 Qualifiers::ObjCLifetime lifetime; 3825 if (attr.getParameterName()->isStr("none")) 3826 lifetime = Qualifiers::OCL_ExplicitNone; 3827 else if (attr.getParameterName()->isStr("strong")) 3828 lifetime = Qualifiers::OCL_Strong; 3829 else if (attr.getParameterName()->isStr("weak")) 3830 lifetime = Qualifiers::OCL_Weak; 3831 else if (attr.getParameterName()->isStr("autoreleasing")) 3832 lifetime = Qualifiers::OCL_Autoreleasing; 3833 else { 3834 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3835 << "objc_ownership" << attr.getParameterName(); 3836 attr.setInvalid(); 3837 return true; 3838 } 3839 3840 SplitQualType underlyingType = type.split(); 3841 3842 // Check for redundant/conflicting ownership qualifiers. 3843 if (Qualifiers::ObjCLifetime previousLifetime 3844 = type.getQualifiers().getObjCLifetime()) { 3845 // If it's written directly, that's an error. 3846 if (hasDirectOwnershipQualifier(type)) { 3847 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3848 << type; 3849 return true; 3850 } 3851 3852 // Otherwise, if the qualifiers actually conflict, pull sugar off 3853 // until we reach a type that is directly qualified. 3854 if (previousLifetime != lifetime) { 3855 // This should always terminate: the canonical type is 3856 // qualified, so some bit of sugar must be hiding it. 3857 while (!underlyingType.Quals.hasObjCLifetime()) { 3858 underlyingType = underlyingType.getSingleStepDesugaredType(); 3859 } 3860 underlyingType.Quals.removeObjCLifetime(); 3861 } 3862 } 3863 3864 underlyingType.Quals.addObjCLifetime(lifetime); 3865 3866 if (NonObjCPointer) { 3867 StringRef name = attr.getName()->getName(); 3868 switch (lifetime) { 3869 case Qualifiers::OCL_None: 3870 case Qualifiers::OCL_ExplicitNone: 3871 break; 3872 case Qualifiers::OCL_Strong: name = "__strong"; break; 3873 case Qualifiers::OCL_Weak: name = "__weak"; break; 3874 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3875 } 3876 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3877 << name << type; 3878 } 3879 3880 QualType origType = type; 3881 if (!NonObjCPointer) 3882 type = S.Context.getQualifiedType(underlyingType); 3883 3884 // If we have a valid source location for the attribute, use an 3885 // AttributedType instead. 3886 if (AttrLoc.isValid()) 3887 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3888 origType, type); 3889 3890 // Forbid __weak if the runtime doesn't support it. 3891 if (lifetime == Qualifiers::OCL_Weak && 3892 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3893 3894 // Actually, delay this until we know what we're parsing. 3895 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3896 S.DelayedDiagnostics.add( 3897 sema::DelayedDiagnostic::makeForbiddenType( 3898 S.getSourceManager().getExpansionLoc(AttrLoc), 3899 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3900 } else { 3901 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3902 } 3903 3904 attr.setInvalid(); 3905 return true; 3906 } 3907 3908 // Forbid __weak for class objects marked as 3909 // objc_arc_weak_reference_unavailable 3910 if (lifetime == Qualifiers::OCL_Weak) { 3911 if (const ObjCObjectPointerType *ObjT = 3912 type->getAs<ObjCObjectPointerType>()) { 3913 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3914 if (Class->isArcWeakrefUnavailable()) { 3915 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3916 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3917 diag::note_class_declared); 3918 } 3919 } 3920 } 3921 } 3922 3923 return true; 3924} 3925 3926/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3927/// attribute on the specified type. Returns true to indicate that 3928/// the attribute was handled, false to indicate that the type does 3929/// not permit the attribute. 3930static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3931 AttributeList &attr, 3932 QualType &type) { 3933 Sema &S = state.getSema(); 3934 3935 // Delay if this isn't some kind of pointer. 3936 if (!type->isPointerType() && 3937 !type->isObjCObjectPointerType() && 3938 !type->isBlockPointerType()) 3939 return false; 3940 3941 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3942 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3943 attr.setInvalid(); 3944 return true; 3945 } 3946 3947 // Check the attribute arguments. 3948 if (!attr.getParameterName()) { 3949 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3950 << "objc_gc" << 1; 3951 attr.setInvalid(); 3952 return true; 3953 } 3954 Qualifiers::GC GCAttr; 3955 if (attr.getNumArgs() != 0) { 3956 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3957 attr.setInvalid(); 3958 return true; 3959 } 3960 if (attr.getParameterName()->isStr("weak")) 3961 GCAttr = Qualifiers::Weak; 3962 else if (attr.getParameterName()->isStr("strong")) 3963 GCAttr = Qualifiers::Strong; 3964 else { 3965 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3966 << "objc_gc" << attr.getParameterName(); 3967 attr.setInvalid(); 3968 return true; 3969 } 3970 3971 QualType origType = type; 3972 type = S.Context.getObjCGCQualType(origType, GCAttr); 3973 3974 // Make an attributed type to preserve the source information. 3975 if (attr.getLoc().isValid()) 3976 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3977 origType, type); 3978 3979 return true; 3980} 3981 3982namespace { 3983 /// A helper class to unwrap a type down to a function for the 3984 /// purposes of applying attributes there. 3985 /// 3986 /// Use: 3987 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3988 /// if (unwrapped.isFunctionType()) { 3989 /// const FunctionType *fn = unwrapped.get(); 3990 /// // change fn somehow 3991 /// T = unwrapped.wrap(fn); 3992 /// } 3993 struct FunctionTypeUnwrapper { 3994 enum WrapKind { 3995 Desugar, 3996 Parens, 3997 Pointer, 3998 BlockPointer, 3999 Reference, 4000 MemberPointer 4001 }; 4002 4003 QualType Original; 4004 const FunctionType *Fn; 4005 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 4006 4007 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 4008 while (true) { 4009 const Type *Ty = T.getTypePtr(); 4010 if (isa<FunctionType>(Ty)) { 4011 Fn = cast<FunctionType>(Ty); 4012 return; 4013 } else if (isa<ParenType>(Ty)) { 4014 T = cast<ParenType>(Ty)->getInnerType(); 4015 Stack.push_back(Parens); 4016 } else if (isa<PointerType>(Ty)) { 4017 T = cast<PointerType>(Ty)->getPointeeType(); 4018 Stack.push_back(Pointer); 4019 } else if (isa<BlockPointerType>(Ty)) { 4020 T = cast<BlockPointerType>(Ty)->getPointeeType(); 4021 Stack.push_back(BlockPointer); 4022 } else if (isa<MemberPointerType>(Ty)) { 4023 T = cast<MemberPointerType>(Ty)->getPointeeType(); 4024 Stack.push_back(MemberPointer); 4025 } else if (isa<ReferenceType>(Ty)) { 4026 T = cast<ReferenceType>(Ty)->getPointeeType(); 4027 Stack.push_back(Reference); 4028 } else { 4029 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 4030 if (Ty == DTy) { 4031 Fn = 0; 4032 return; 4033 } 4034 4035 T = QualType(DTy, 0); 4036 Stack.push_back(Desugar); 4037 } 4038 } 4039 } 4040 4041 bool isFunctionType() const { return (Fn != 0); } 4042 const FunctionType *get() const { return Fn; } 4043 4044 QualType wrap(Sema &S, const FunctionType *New) { 4045 // If T wasn't modified from the unwrapped type, do nothing. 4046 if (New == get()) return Original; 4047 4048 Fn = New; 4049 return wrap(S.Context, Original, 0); 4050 } 4051 4052 private: 4053 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 4054 if (I == Stack.size()) 4055 return C.getQualifiedType(Fn, Old.getQualifiers()); 4056 4057 // Build up the inner type, applying the qualifiers from the old 4058 // type to the new type. 4059 SplitQualType SplitOld = Old.split(); 4060 4061 // As a special case, tail-recurse if there are no qualifiers. 4062 if (SplitOld.Quals.empty()) 4063 return wrap(C, SplitOld.Ty, I); 4064 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 4065 } 4066 4067 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 4068 if (I == Stack.size()) return QualType(Fn, 0); 4069 4070 switch (static_cast<WrapKind>(Stack[I++])) { 4071 case Desugar: 4072 // This is the point at which we potentially lose source 4073 // information. 4074 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 4075 4076 case Parens: { 4077 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 4078 return C.getParenType(New); 4079 } 4080 4081 case Pointer: { 4082 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 4083 return C.getPointerType(New); 4084 } 4085 4086 case BlockPointer: { 4087 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 4088 return C.getBlockPointerType(New); 4089 } 4090 4091 case MemberPointer: { 4092 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 4093 QualType New = wrap(C, OldMPT->getPointeeType(), I); 4094 return C.getMemberPointerType(New, OldMPT->getClass()); 4095 } 4096 4097 case Reference: { 4098 const ReferenceType *OldRef = cast<ReferenceType>(Old); 4099 QualType New = wrap(C, OldRef->getPointeeType(), I); 4100 if (isa<LValueReferenceType>(OldRef)) 4101 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 4102 else 4103 return C.getRValueReferenceType(New); 4104 } 4105 } 4106 4107 llvm_unreachable("unknown wrapping kind"); 4108 } 4109 }; 4110} 4111 4112/// Process an individual function attribute. Returns true to 4113/// indicate that the attribute was handled, false if it wasn't. 4114static bool handleFunctionTypeAttr(TypeProcessingState &state, 4115 AttributeList &attr, 4116 QualType &type) { 4117 Sema &S = state.getSema(); 4118 4119 FunctionTypeUnwrapper unwrapped(S, type); 4120 4121 if (attr.getKind() == AttributeList::AT_NoReturn) { 4122 if (S.CheckNoReturnAttr(attr)) 4123 return true; 4124 4125 // Delay if this is not a function type. 4126 if (!unwrapped.isFunctionType()) 4127 return false; 4128 4129 // Otherwise we can process right away. 4130 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 4131 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4132 return true; 4133 } 4134 4135 // ns_returns_retained is not always a type attribute, but if we got 4136 // here, we're treating it as one right now. 4137 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 4138 assert(S.getLangOpts().ObjCAutoRefCount && 4139 "ns_returns_retained treated as type attribute in non-ARC"); 4140 if (attr.getNumArgs()) return true; 4141 4142 // Delay if this is not a function type. 4143 if (!unwrapped.isFunctionType()) 4144 return false; 4145 4146 FunctionType::ExtInfo EI 4147 = unwrapped.get()->getExtInfo().withProducesResult(true); 4148 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4149 return true; 4150 } 4151 4152 if (attr.getKind() == AttributeList::AT_Regparm) { 4153 unsigned value; 4154 if (S.CheckRegparmAttr(attr, value)) 4155 return true; 4156 4157 // Delay if this is not a function type. 4158 if (!unwrapped.isFunctionType()) 4159 return false; 4160 4161 // Diagnose regparm with fastcall. 4162 const FunctionType *fn = unwrapped.get(); 4163 CallingConv CC = fn->getCallConv(); 4164 if (CC == CC_X86FastCall) { 4165 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4166 << FunctionType::getNameForCallConv(CC) 4167 << "regparm"; 4168 attr.setInvalid(); 4169 return true; 4170 } 4171 4172 FunctionType::ExtInfo EI = 4173 unwrapped.get()->getExtInfo().withRegParm(value); 4174 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4175 return true; 4176 } 4177 4178 // Delay if the type didn't work out to a function. 4179 if (!unwrapped.isFunctionType()) return false; 4180 4181 // Otherwise, a calling convention. 4182 CallingConv CC; 4183 if (S.CheckCallingConvAttr(attr, CC)) 4184 return true; 4185 4186 const FunctionType *fn = unwrapped.get(); 4187 CallingConv CCOld = fn->getCallConv(); 4188 if (S.Context.getCanonicalCallConv(CC) == 4189 S.Context.getCanonicalCallConv(CCOld)) { 4190 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 4191 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4192 return true; 4193 } 4194 4195 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 4196 // Should we diagnose reapplications of the same convention? 4197 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4198 << FunctionType::getNameForCallConv(CC) 4199 << FunctionType::getNameForCallConv(CCOld); 4200 attr.setInvalid(); 4201 return true; 4202 } 4203 4204 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 4205 if (CC == CC_X86FastCall) { 4206 if (isa<FunctionNoProtoType>(fn)) { 4207 S.Diag(attr.getLoc(), diag::err_cconv_knr) 4208 << FunctionType::getNameForCallConv(CC); 4209 attr.setInvalid(); 4210 return true; 4211 } 4212 4213 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 4214 if (FnP->isVariadic()) { 4215 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 4216 << FunctionType::getNameForCallConv(CC); 4217 attr.setInvalid(); 4218 return true; 4219 } 4220 4221 // Also diagnose fastcall with regparm. 4222 if (fn->getHasRegParm()) { 4223 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4224 << "regparm" 4225 << FunctionType::getNameForCallConv(CC); 4226 attr.setInvalid(); 4227 return true; 4228 } 4229 } 4230 4231 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 4232 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4233 return true; 4234} 4235 4236/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4237static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4238 const AttributeList &Attr, 4239 Sema &S) { 4240 // Check the attribute arguments. 4241 if (Attr.getNumArgs() != 1) { 4242 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4243 Attr.setInvalid(); 4244 return; 4245 } 4246 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4247 llvm::APSInt arg(32); 4248 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4249 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4250 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4251 << "opencl_image_access" << sizeExpr->getSourceRange(); 4252 Attr.setInvalid(); 4253 return; 4254 } 4255 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4256 switch (iarg) { 4257 case CLIA_read_only: 4258 case CLIA_write_only: 4259 case CLIA_read_write: 4260 // Implemented in a separate patch 4261 break; 4262 default: 4263 // Implemented in a separate patch 4264 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4265 << sizeExpr->getSourceRange(); 4266 Attr.setInvalid(); 4267 break; 4268 } 4269} 4270 4271/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4272/// and float scalars, although arrays, pointers, and function return values are 4273/// allowed in conjunction with this construct. Aggregates with this attribute 4274/// are invalid, even if they are of the same size as a corresponding scalar. 4275/// The raw attribute should contain precisely 1 argument, the vector size for 4276/// the variable, measured in bytes. If curType and rawAttr are well formed, 4277/// this routine will return a new vector type. 4278static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4279 Sema &S) { 4280 // Check the attribute arguments. 4281 if (Attr.getNumArgs() != 1) { 4282 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4283 Attr.setInvalid(); 4284 return; 4285 } 4286 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4287 llvm::APSInt vecSize(32); 4288 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4289 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4290 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4291 << "vector_size" << sizeExpr->getSourceRange(); 4292 Attr.setInvalid(); 4293 return; 4294 } 4295 // the base type must be integer or float, and can't already be a vector. 4296 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4297 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4298 Attr.setInvalid(); 4299 return; 4300 } 4301 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4302 // vecSize is specified in bytes - convert to bits. 4303 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4304 4305 // the vector size needs to be an integral multiple of the type size. 4306 if (vectorSize % typeSize) { 4307 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4308 << sizeExpr->getSourceRange(); 4309 Attr.setInvalid(); 4310 return; 4311 } 4312 if (vectorSize == 0) { 4313 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4314 << sizeExpr->getSourceRange(); 4315 Attr.setInvalid(); 4316 return; 4317 } 4318 4319 // Success! Instantiate the vector type, the number of elements is > 0, and 4320 // not required to be a power of 2, unlike GCC. 4321 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4322 VectorType::GenericVector); 4323} 4324 4325/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4326/// a type. 4327static void HandleExtVectorTypeAttr(QualType &CurType, 4328 const AttributeList &Attr, 4329 Sema &S) { 4330 Expr *sizeExpr; 4331 4332 // Special case where the argument is a template id. 4333 if (Attr.getParameterName()) { 4334 CXXScopeSpec SS; 4335 SourceLocation TemplateKWLoc; 4336 UnqualifiedId id; 4337 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4338 4339 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4340 id, false, false); 4341 if (Size.isInvalid()) 4342 return; 4343 4344 sizeExpr = Size.get(); 4345 } else { 4346 // check the attribute arguments. 4347 if (Attr.getNumArgs() != 1) { 4348 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4349 return; 4350 } 4351 sizeExpr = Attr.getArg(0); 4352 } 4353 4354 // Create the vector type. 4355 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4356 if (!T.isNull()) 4357 CurType = T; 4358} 4359 4360/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4361/// "neon_polyvector_type" attributes are used to create vector types that 4362/// are mangled according to ARM's ABI. Otherwise, these types are identical 4363/// to those created with the "vector_size" attribute. Unlike "vector_size" 4364/// the argument to these Neon attributes is the number of vector elements, 4365/// not the vector size in bytes. The vector width and element type must 4366/// match one of the standard Neon vector types. 4367static void HandleNeonVectorTypeAttr(QualType& CurType, 4368 const AttributeList &Attr, Sema &S, 4369 VectorType::VectorKind VecKind, 4370 const char *AttrName) { 4371 // Check the attribute arguments. 4372 if (Attr.getNumArgs() != 1) { 4373 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4374 Attr.setInvalid(); 4375 return; 4376 } 4377 // The number of elements must be an ICE. 4378 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4379 llvm::APSInt numEltsInt(32); 4380 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4381 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4382 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4383 << AttrName << numEltsExpr->getSourceRange(); 4384 Attr.setInvalid(); 4385 return; 4386 } 4387 // Only certain element types are supported for Neon vectors. 4388 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4389 if (!BTy || 4390 (VecKind == VectorType::NeonPolyVector && 4391 BTy->getKind() != BuiltinType::SChar && 4392 BTy->getKind() != BuiltinType::Short) || 4393 (BTy->getKind() != BuiltinType::SChar && 4394 BTy->getKind() != BuiltinType::UChar && 4395 BTy->getKind() != BuiltinType::Short && 4396 BTy->getKind() != BuiltinType::UShort && 4397 BTy->getKind() != BuiltinType::Int && 4398 BTy->getKind() != BuiltinType::UInt && 4399 BTy->getKind() != BuiltinType::LongLong && 4400 BTy->getKind() != BuiltinType::ULongLong && 4401 BTy->getKind() != BuiltinType::Float)) { 4402 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4403 Attr.setInvalid(); 4404 return; 4405 } 4406 // The total size of the vector must be 64 or 128 bits. 4407 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4408 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4409 unsigned vecSize = typeSize * numElts; 4410 if (vecSize != 64 && vecSize != 128) { 4411 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4412 Attr.setInvalid(); 4413 return; 4414 } 4415 4416 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4417} 4418 4419static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4420 TypeAttrLocation TAL, AttributeList *attrs) { 4421 // Scan through and apply attributes to this type where it makes sense. Some 4422 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4423 // type, but others can be present in the type specifiers even though they 4424 // apply to the decl. Here we apply type attributes and ignore the rest. 4425 4426 AttributeList *next; 4427 do { 4428 AttributeList &attr = *attrs; 4429 next = attr.getNext(); 4430 4431 // Skip attributes that were marked to be invalid. 4432 if (attr.isInvalid()) 4433 continue; 4434 4435 if (attr.isCXX11Attribute()) { 4436 // [[gnu::...]] attributes are treated as declaration attributes, so may 4437 // not appertain to a DeclaratorChunk, even if we handle them as type 4438 // attributes. 4439 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4440 if (TAL == TAL_DeclChunk) { 4441 state.getSema().Diag(attr.getLoc(), 4442 diag::warn_cxx11_gnu_attribute_on_type) 4443 << attr.getName(); 4444 continue; 4445 } 4446 } else if (TAL != TAL_DeclChunk) { 4447 // Otherwise, only consider type processing for a C++11 attribute if 4448 // it's actually been applied to a type. 4449 continue; 4450 } 4451 } 4452 4453 // If this is an attribute we can handle, do so now, 4454 // otherwise, add it to the FnAttrs list for rechaining. 4455 switch (attr.getKind()) { 4456 default: 4457 // A C++11 attribute on a declarator chunk must appertain to a type. 4458 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 4459 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4460 << attr.getName(); 4461 attr.setUsedAsTypeAttr(); 4462 } 4463 break; 4464 4465 case AttributeList::UnknownAttribute: 4466 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4467 state.getSema().Diag(attr.getLoc(), 4468 diag::warn_unknown_attribute_ignored) 4469 << attr.getName(); 4470 break; 4471 4472 case AttributeList::IgnoredAttribute: 4473 break; 4474 4475 case AttributeList::AT_MayAlias: 4476 // FIXME: This attribute needs to actually be handled, but if we ignore 4477 // it it breaks large amounts of Linux software. 4478 attr.setUsedAsTypeAttr(); 4479 break; 4480 case AttributeList::AT_AddressSpace: 4481 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4482 attr.setUsedAsTypeAttr(); 4483 break; 4484 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4485 if (!handleObjCPointerTypeAttr(state, attr, type)) 4486 distributeObjCPointerTypeAttr(state, attr, type); 4487 attr.setUsedAsTypeAttr(); 4488 break; 4489 case AttributeList::AT_VectorSize: 4490 HandleVectorSizeAttr(type, attr, state.getSema()); 4491 attr.setUsedAsTypeAttr(); 4492 break; 4493 case AttributeList::AT_ExtVectorType: 4494 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4495 attr.setUsedAsTypeAttr(); 4496 break; 4497 case AttributeList::AT_NeonVectorType: 4498 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4499 VectorType::NeonVector, "neon_vector_type"); 4500 attr.setUsedAsTypeAttr(); 4501 break; 4502 case AttributeList::AT_NeonPolyVectorType: 4503 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4504 VectorType::NeonPolyVector, 4505 "neon_polyvector_type"); 4506 attr.setUsedAsTypeAttr(); 4507 break; 4508 case AttributeList::AT_OpenCLImageAccess: 4509 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4510 attr.setUsedAsTypeAttr(); 4511 break; 4512 4513 case AttributeList::AT_Win64: 4514 case AttributeList::AT_Ptr32: 4515 case AttributeList::AT_Ptr64: 4516 // FIXME: Don't ignore these. We have partial handling for them as 4517 // declaration attributes in SemaDeclAttr.cpp; that should be moved here. 4518 attr.setUsedAsTypeAttr(); 4519 break; 4520 4521 case AttributeList::AT_NSReturnsRetained: 4522 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4523 break; 4524 // fallthrough into the function attrs 4525 4526 FUNCTION_TYPE_ATTRS_CASELIST: 4527 attr.setUsedAsTypeAttr(); 4528 4529 // Never process function type attributes as part of the 4530 // declaration-specifiers. 4531 if (TAL == TAL_DeclSpec) 4532 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4533 4534 // Otherwise, handle the possible delays. 4535 else if (!handleFunctionTypeAttr(state, attr, type)) 4536 distributeFunctionTypeAttr(state, attr, type); 4537 break; 4538 } 4539 } while ((attrs = next)); 4540} 4541 4542/// \brief Ensure that the type of the given expression is complete. 4543/// 4544/// This routine checks whether the expression \p E has a complete type. If the 4545/// expression refers to an instantiable construct, that instantiation is 4546/// performed as needed to complete its type. Furthermore 4547/// Sema::RequireCompleteType is called for the expression's type (or in the 4548/// case of a reference type, the referred-to type). 4549/// 4550/// \param E The expression whose type is required to be complete. 4551/// \param Diagnoser The object that will emit a diagnostic if the type is 4552/// incomplete. 4553/// 4554/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4555/// otherwise. 4556bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4557 QualType T = E->getType(); 4558 4559 // Fast path the case where the type is already complete. 4560 if (!T->isIncompleteType()) 4561 return false; 4562 4563 // Incomplete array types may be completed by the initializer attached to 4564 // their definitions. For static data members of class templates we need to 4565 // instantiate the definition to get this initializer and complete the type. 4566 if (T->isIncompleteArrayType()) { 4567 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4568 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4569 if (Var->isStaticDataMember() && 4570 Var->getInstantiatedFromStaticDataMember()) { 4571 4572 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4573 assert(MSInfo && "Missing member specialization information?"); 4574 if (MSInfo->getTemplateSpecializationKind() 4575 != TSK_ExplicitSpecialization) { 4576 // If we don't already have a point of instantiation, this is it. 4577 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4578 MSInfo->setPointOfInstantiation(E->getLocStart()); 4579 4580 // This is a modification of an existing AST node. Notify 4581 // listeners. 4582 if (ASTMutationListener *L = getASTMutationListener()) 4583 L->StaticDataMemberInstantiated(Var); 4584 } 4585 4586 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4587 4588 // Update the type to the newly instantiated definition's type both 4589 // here and within the expression. 4590 if (VarDecl *Def = Var->getDefinition()) { 4591 DRE->setDecl(Def); 4592 T = Def->getType(); 4593 DRE->setType(T); 4594 E->setType(T); 4595 } 4596 } 4597 4598 // We still go on to try to complete the type independently, as it 4599 // may also require instantiations or diagnostics if it remains 4600 // incomplete. 4601 } 4602 } 4603 } 4604 } 4605 4606 // FIXME: Are there other cases which require instantiating something other 4607 // than the type to complete the type of an expression? 4608 4609 // Look through reference types and complete the referred type. 4610 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4611 T = Ref->getPointeeType(); 4612 4613 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4614} 4615 4616namespace { 4617 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4618 unsigned DiagID; 4619 4620 TypeDiagnoserDiag(unsigned DiagID) 4621 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4622 4623 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4624 if (Suppressed) return; 4625 S.Diag(Loc, DiagID) << T; 4626 } 4627 }; 4628} 4629 4630bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4631 TypeDiagnoserDiag Diagnoser(DiagID); 4632 return RequireCompleteExprType(E, Diagnoser); 4633} 4634 4635/// @brief Ensure that the type T is a complete type. 4636/// 4637/// This routine checks whether the type @p T is complete in any 4638/// context where a complete type is required. If @p T is a complete 4639/// type, returns false. If @p T is a class template specialization, 4640/// this routine then attempts to perform class template 4641/// instantiation. If instantiation fails, or if @p T is incomplete 4642/// and cannot be completed, issues the diagnostic @p diag (giving it 4643/// the type @p T) and returns true. 4644/// 4645/// @param Loc The location in the source that the incomplete type 4646/// diagnostic should refer to. 4647/// 4648/// @param T The type that this routine is examining for completeness. 4649/// 4650/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4651/// @c false otherwise. 4652bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4653 TypeDiagnoser &Diagnoser) { 4654 // FIXME: Add this assertion to make sure we always get instantiation points. 4655 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4656 // FIXME: Add this assertion to help us flush out problems with 4657 // checking for dependent types and type-dependent expressions. 4658 // 4659 // assert(!T->isDependentType() && 4660 // "Can't ask whether a dependent type is complete"); 4661 4662 // If we have a complete type, we're done. 4663 NamedDecl *Def = 0; 4664 if (!T->isIncompleteType(&Def)) { 4665 // If we know about the definition but it is not visible, complain. 4666 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4667 // Suppress this error outside of a SFINAE context if we've already 4668 // emitted the error once for this type. There's no usefulness in 4669 // repeating the diagnostic. 4670 // FIXME: Add a Fix-It that imports the corresponding module or includes 4671 // the header. 4672 Module *Owner = Def->getOwningModule(); 4673 Diag(Loc, diag::err_module_private_definition) 4674 << T << Owner->getFullModuleName(); 4675 Diag(Def->getLocation(), diag::note_previous_definition); 4676 4677 if (!isSFINAEContext()) { 4678 // Recover by implicitly importing this module. 4679 createImplicitModuleImport(Loc, Owner); 4680 } 4681 } 4682 4683 return false; 4684 } 4685 4686 const TagType *Tag = T->getAs<TagType>(); 4687 const ObjCInterfaceType *IFace = 0; 4688 4689 if (Tag) { 4690 // Avoid diagnosing invalid decls as incomplete. 4691 if (Tag->getDecl()->isInvalidDecl()) 4692 return true; 4693 4694 // Give the external AST source a chance to complete the type. 4695 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4696 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4697 if (!Tag->isIncompleteType()) 4698 return false; 4699 } 4700 } 4701 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4702 // Avoid diagnosing invalid decls as incomplete. 4703 if (IFace->getDecl()->isInvalidDecl()) 4704 return true; 4705 4706 // Give the external AST source a chance to complete the type. 4707 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4708 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4709 if (!IFace->isIncompleteType()) 4710 return false; 4711 } 4712 } 4713 4714 // If we have a class template specialization or a class member of a 4715 // class template specialization, or an array with known size of such, 4716 // try to instantiate it. 4717 QualType MaybeTemplate = T; 4718 while (const ConstantArrayType *Array 4719 = Context.getAsConstantArrayType(MaybeTemplate)) 4720 MaybeTemplate = Array->getElementType(); 4721 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4722 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4723 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4724 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4725 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4726 TSK_ImplicitInstantiation, 4727 /*Complain=*/!Diagnoser.Suppressed); 4728 } else if (CXXRecordDecl *Rec 4729 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4730 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4731 if (!Rec->isBeingDefined() && Pattern) { 4732 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4733 assert(MSI && "Missing member specialization information?"); 4734 // This record was instantiated from a class within a template. 4735 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4736 return InstantiateClass(Loc, Rec, Pattern, 4737 getTemplateInstantiationArgs(Rec), 4738 TSK_ImplicitInstantiation, 4739 /*Complain=*/!Diagnoser.Suppressed); 4740 } 4741 } 4742 } 4743 4744 if (Diagnoser.Suppressed) 4745 return true; 4746 4747 // We have an incomplete type. Produce a diagnostic. 4748 Diagnoser.diagnose(*this, Loc, T); 4749 4750 // If the type was a forward declaration of a class/struct/union 4751 // type, produce a note. 4752 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4753 Diag(Tag->getDecl()->getLocation(), 4754 Tag->isBeingDefined() ? diag::note_type_being_defined 4755 : diag::note_forward_declaration) 4756 << QualType(Tag, 0); 4757 4758 // If the Objective-C class was a forward declaration, produce a note. 4759 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4760 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4761 4762 return true; 4763} 4764 4765bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4766 unsigned DiagID) { 4767 TypeDiagnoserDiag Diagnoser(DiagID); 4768 return RequireCompleteType(Loc, T, Diagnoser); 4769} 4770 4771/// \brief Get diagnostic %select index for tag kind for 4772/// literal type diagnostic message. 4773/// WARNING: Indexes apply to particular diagnostics only! 4774/// 4775/// \returns diagnostic %select index. 4776static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4777 switch (Tag) { 4778 case TTK_Struct: return 0; 4779 case TTK_Interface: return 1; 4780 case TTK_Class: return 2; 4781 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4782 } 4783} 4784 4785/// @brief Ensure that the type T is a literal type. 4786/// 4787/// This routine checks whether the type @p T is a literal type. If @p T is an 4788/// incomplete type, an attempt is made to complete it. If @p T is a literal 4789/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4790/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4791/// it the type @p T), along with notes explaining why the type is not a 4792/// literal type, and returns true. 4793/// 4794/// @param Loc The location in the source that the non-literal type 4795/// diagnostic should refer to. 4796/// 4797/// @param T The type that this routine is examining for literalness. 4798/// 4799/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4800/// 4801/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4802/// @c false otherwise. 4803bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4804 TypeDiagnoser &Diagnoser) { 4805 assert(!T->isDependentType() && "type should not be dependent"); 4806 4807 QualType ElemType = Context.getBaseElementType(T); 4808 RequireCompleteType(Loc, ElemType, 0); 4809 4810 if (T->isLiteralType()) 4811 return false; 4812 4813 if (Diagnoser.Suppressed) 4814 return true; 4815 4816 Diagnoser.diagnose(*this, Loc, T); 4817 4818 if (T->isVariableArrayType()) 4819 return true; 4820 4821 const RecordType *RT = ElemType->getAs<RecordType>(); 4822 if (!RT) 4823 return true; 4824 4825 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4826 4827 // A partially-defined class type can't be a literal type, because a literal 4828 // class type must have a trivial destructor (which can't be checked until 4829 // the class definition is complete). 4830 if (!RD->isCompleteDefinition()) { 4831 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4832 return true; 4833 } 4834 4835 // If the class has virtual base classes, then it's not an aggregate, and 4836 // cannot have any constexpr constructors or a trivial default constructor, 4837 // so is non-literal. This is better to diagnose than the resulting absence 4838 // of constexpr constructors. 4839 if (RD->getNumVBases()) { 4840 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4841 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4842 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4843 E = RD->vbases_end(); I != E; ++I) 4844 Diag(I->getLocStart(), 4845 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4846 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4847 !RD->hasTrivialDefaultConstructor()) { 4848 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4849 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4850 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4851 E = RD->bases_end(); I != E; ++I) { 4852 if (!I->getType()->isLiteralType()) { 4853 Diag(I->getLocStart(), 4854 diag::note_non_literal_base_class) 4855 << RD << I->getType() << I->getSourceRange(); 4856 return true; 4857 } 4858 } 4859 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4860 E = RD->field_end(); I != E; ++I) { 4861 if (!I->getType()->isLiteralType() || 4862 I->getType().isVolatileQualified()) { 4863 Diag(I->getLocation(), diag::note_non_literal_field) 4864 << RD << *I << I->getType() 4865 << I->getType().isVolatileQualified(); 4866 return true; 4867 } 4868 } 4869 } else if (!RD->hasTrivialDestructor()) { 4870 // All fields and bases are of literal types, so have trivial destructors. 4871 // If this class's destructor is non-trivial it must be user-declared. 4872 CXXDestructorDecl *Dtor = RD->getDestructor(); 4873 assert(Dtor && "class has literal fields and bases but no dtor?"); 4874 if (!Dtor) 4875 return true; 4876 4877 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4878 diag::note_non_literal_user_provided_dtor : 4879 diag::note_non_literal_nontrivial_dtor) << RD; 4880 if (!Dtor->isUserProvided()) 4881 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 4882 } 4883 4884 return true; 4885} 4886 4887bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4888 TypeDiagnoserDiag Diagnoser(DiagID); 4889 return RequireLiteralType(Loc, T, Diagnoser); 4890} 4891 4892/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4893/// and qualified by the nested-name-specifier contained in SS. 4894QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4895 const CXXScopeSpec &SS, QualType T) { 4896 if (T.isNull()) 4897 return T; 4898 NestedNameSpecifier *NNS; 4899 if (SS.isValid()) 4900 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4901 else { 4902 if (Keyword == ETK_None) 4903 return T; 4904 NNS = 0; 4905 } 4906 return Context.getElaboratedType(Keyword, NNS, T); 4907} 4908 4909QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4910 ExprResult ER = CheckPlaceholderExpr(E); 4911 if (ER.isInvalid()) return QualType(); 4912 E = ER.take(); 4913 4914 if (!E->isTypeDependent()) { 4915 QualType T = E->getType(); 4916 if (const TagType *TT = T->getAs<TagType>()) 4917 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4918 } 4919 return Context.getTypeOfExprType(E); 4920} 4921 4922/// getDecltypeForExpr - Given an expr, will return the decltype for 4923/// that expression, according to the rules in C++11 4924/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4925static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4926 if (E->isTypeDependent()) 4927 return S.Context.DependentTy; 4928 4929 // C++11 [dcl.type.simple]p4: 4930 // The type denoted by decltype(e) is defined as follows: 4931 // 4932 // - if e is an unparenthesized id-expression or an unparenthesized class 4933 // member access (5.2.5), decltype(e) is the type of the entity named 4934 // by e. If there is no such entity, or if e names a set of overloaded 4935 // functions, the program is ill-formed; 4936 // 4937 // We apply the same rules for Objective-C ivar and property references. 4938 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4939 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4940 return VD->getType(); 4941 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4942 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4943 return FD->getType(); 4944 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4945 return IR->getDecl()->getType(); 4946 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4947 if (PR->isExplicitProperty()) 4948 return PR->getExplicitProperty()->getType(); 4949 } 4950 4951 // C++11 [expr.lambda.prim]p18: 4952 // Every occurrence of decltype((x)) where x is a possibly 4953 // parenthesized id-expression that names an entity of automatic 4954 // storage duration is treated as if x were transformed into an 4955 // access to a corresponding data member of the closure type that 4956 // would have been declared if x were an odr-use of the denoted 4957 // entity. 4958 using namespace sema; 4959 if (S.getCurLambda()) { 4960 if (isa<ParenExpr>(E)) { 4961 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4962 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4963 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4964 if (!T.isNull()) 4965 return S.Context.getLValueReferenceType(T); 4966 } 4967 } 4968 } 4969 } 4970 4971 4972 // C++11 [dcl.type.simple]p4: 4973 // [...] 4974 QualType T = E->getType(); 4975 switch (E->getValueKind()) { 4976 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4977 // type of e; 4978 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4979 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4980 // type of e; 4981 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4982 // - otherwise, decltype(e) is the type of e. 4983 case VK_RValue: break; 4984 } 4985 4986 return T; 4987} 4988 4989QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4990 ExprResult ER = CheckPlaceholderExpr(E); 4991 if (ER.isInvalid()) return QualType(); 4992 E = ER.take(); 4993 4994 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4995} 4996 4997QualType Sema::BuildUnaryTransformType(QualType BaseType, 4998 UnaryTransformType::UTTKind UKind, 4999 SourceLocation Loc) { 5000 switch (UKind) { 5001 case UnaryTransformType::EnumUnderlyingType: 5002 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 5003 Diag(Loc, diag::err_only_enums_have_underlying_types); 5004 return QualType(); 5005 } else { 5006 QualType Underlying = BaseType; 5007 if (!BaseType->isDependentType()) { 5008 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 5009 assert(ED && "EnumType has no EnumDecl"); 5010 DiagnoseUseOfDecl(ED, Loc); 5011 Underlying = ED->getIntegerType(); 5012 } 5013 assert(!Underlying.isNull()); 5014 return Context.getUnaryTransformType(BaseType, Underlying, 5015 UnaryTransformType::EnumUnderlyingType); 5016 } 5017 } 5018 llvm_unreachable("unknown unary transform type"); 5019} 5020 5021QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 5022 if (!T->isDependentType()) { 5023 // FIXME: It isn't entirely clear whether incomplete atomic types 5024 // are allowed or not; for simplicity, ban them for the moment. 5025 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 5026 return QualType(); 5027 5028 int DisallowedKind = -1; 5029 if (T->isArrayType()) 5030 DisallowedKind = 1; 5031 else if (T->isFunctionType()) 5032 DisallowedKind = 2; 5033 else if (T->isReferenceType()) 5034 DisallowedKind = 3; 5035 else if (T->isAtomicType()) 5036 DisallowedKind = 4; 5037 else if (T.hasQualifiers()) 5038 DisallowedKind = 5; 5039 else if (!T.isTriviallyCopyableType(Context)) 5040 // Some other non-trivially-copyable type (probably a C++ class) 5041 DisallowedKind = 6; 5042 5043 if (DisallowedKind != -1) { 5044 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 5045 return QualType(); 5046 } 5047 5048 // FIXME: Do we need any handling for ARC here? 5049 } 5050 5051 // Build the pointer type. 5052 return Context.getAtomicType(T); 5053} 5054